Three months ended March 31,

2017

2016

Numerator—basic and diluted:

Net income

$

5,932

$

2,521

Denominator:

Weighted-average common shares - basic common stock

20,489,532

19,827,669

Weighted-average common shares - diluted common stock

21,579,721

20,840,367

Net income per share - basic common stock

$

0.29

$

0.13

Net income per share - diluted common stock

$

0.27

$

0.12

Denominator calculation from basic to diluted:

Weighted-average common shares - basic common stock

20,489,532

19,827,669

Stock options

1,090,189

1,012,698

Weighted-average common shares - diluted common stock

21,579,721

20,840,367

Shares excluded from diluted weighted-average shares:

Stock options

25,700

773,033

Shares excluded from diluted weighted-average shares

25,700

773,033