| Summary of Stock Options Activity |
The activity for stock options under the Company’s stock plans for the nine months ended September 30, 2021 is as follows:
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Remaining
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weighted-
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Weighted-
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average
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Per share
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average
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contractual
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average
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Price per
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exercise
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terms
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intrinsic
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Options
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share
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price
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(in years)
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value
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Outstanding as of December 31, 2020
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955,479
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$0.75-$83.30
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$
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35.49
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1.85
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$
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11.81
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Exercised
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(486,038
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)
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0.75-46.66
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28.19
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Forfeited
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(10,000
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)
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83.30
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83.30
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Outstanding as of September 30, 2021
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459,441
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1.17-83.30
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42.18
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1.61
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6.29
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Vested and exercisable as of September 30, 2021
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459,441
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1.17-83.30
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42.18
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1.61
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6.29
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Vested and expected to vest as of September 30, 2021
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459,441
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$1.17-$83.30
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$
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42.18
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1.61
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$
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6.29
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| Summary of Restricted Stock Activity |
Stock Awards activity for the nine months ended September 30, 2021 is summarized below:
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Weighted-
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average
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grant
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Performance
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date fair
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and
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value
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Restricted stock units
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Time-based
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time-based
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Total
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per share
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Unvested restricted stock units as of December 31, 2020
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245,462
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88,458
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333,920
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$
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49.29
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Granted
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240,044
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88,902
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328,946
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56.01
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Vested
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(96,230
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)
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—
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(96,230
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)
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52.07
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Forfeited/canceled
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(66,384
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)
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(69,276
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)
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(135,660
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)
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45.92
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Unvested restricted stock units as of September 30, 2021 (1)
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322,892
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108,084
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430,976
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$
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54.72
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Unvested and expected to vest restricted stock units outstanding as
of September 30, 2021
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373,163
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$
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54.80
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Weighted-
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average
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grant
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Performance
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date fair
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and
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value
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Restricted stock awards
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Time-based
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time-based
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Total
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per share
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Unvested restricted stock awards outstanding as of December 31, 2020
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42,076
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33,355
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75,431
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$
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93.96
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Vested
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(13,247
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)
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—
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|
(13,247
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)
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91.84
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Forfeited/canceled
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(13,945
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)
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(27,399
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)
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(41,344
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)
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100.89
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Unvested restricted stock awards outstanding as of September 30, 2021 (1)
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14,884
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5,956
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20,840
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$
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83.60
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Unvested and expected to vest restricted stock awards outstanding as
of September 30, 2021
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20,081
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$
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86.50
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(1)
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Outstanding restricted stock units and restricted stock awards are based on the maximum payout of the targeted number of shares.
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| Summary of Stock-based Compensation Expense |
Stock-based compensation
Stock-based compensation expense recognized for the three and nine months ended September 30, 2021 and September 30, 2020, was as follows:
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Three months ended
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Nine months ended
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September 30,
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September 30,
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2021
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2020
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2021
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2020
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Stock-based compensation expense by type of award:
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Stock option plan awards
|
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$
|
—
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$
|
—
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$
|
—
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$
|
709
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Restricted stock units and restricted stock awards
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2,631
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1,878
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8,014
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4,853
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|
Employee stock purchase plan
|
|
|
161
|
|
|
|
172
|
|
|
|
533
|
|
|
|
549
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|
Total stock-based compensation expense
|
|
$
|
2,792
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|
$
|
2,050
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|
|
$
|
8,547
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|
|
$
|
6,111
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|
For the three and nine months ended September 30, 2021 and September 30, 2020, respectively, stock-based compensation expense recognized under ASC 718, included in cost of revenue, research and development expense, sales and marketing expense, and general and administrative expense was as follows:
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Three months ended
|
|
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Nine months ended
|
|
|
|
|
September 30,
|
|
|
September 30,
|
|
|
|
|
2021
|
|
|
2020
|
|
|
2021
|
|
|
2020
|
|
|
Cost of revenue
|
|
$
|
269
|
|
|
$
|
185
|
|
|
$
|
826
|
|
|
$
|
511
|
|
|
Research and development
|
|
|
264
|
|
|
|
233
|
|
|
|
944
|
|
|
|
726
|
|
|
Sales and marketing
|
|
|
695
|
|
|
|
516
|
|
|
|
1,975
|
|
|
|
1,587
|
|
|
General and administrative
|
|
|
1,564
|
|
|
|
1,116
|
|
|
|
4,802
|
|
|
|
3,287
|
|
|
Total stock-based compensation expense
|
|
$
|
2,792
|
|
|
$
|
2,050
|
|
|
$
|
8,547
|
|
|
$
|
6,111
|
|
|