Annual report pursuant to Section 13 and 15(d)

Quarterly Summary of Information (Unaudited) - Summary of Unaudited Quarterly Statements of Income Data (Details)

v3.6.0.2
Quarterly Summary of Information (Unaudited) - Summary of Unaudited Quarterly Statements of Income Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2016
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Selected Quarterly Financial Information [Abstract]                          
Net revenue $ 50,851 $ 54,422 $ 54,567 $ 42,989 $ 40,446 $ 40,778 $ 44,029 $ 33,752     $ 202,829 $ 159,005 $ 112,537
Gross profit 24,688 25,128 26,215 21,279 20,038 19,375 20,822 16,023     97,310 76,258 55,517
Income before provision (benefit) for income taxes 5,834 5,449 8,042 3,400 3,317 3,678 5,314 2,418     22,725 14,727 10,052
Provision (benefit) for income taxes 574 203 550 879 (541) 982 1,855 846 $ 1,429 $ 1,632 2,206 3,142 3,226
Net income $ 5,260 $ 5,246 $ 7,492 $ 2,521 $ 3,858 $ 2,696 $ 3,459 $ 1,572 $ 10,013 $ 15,259 $ 20,519 $ 11,585 $ 6,826
Net income per share attributable to common stockholders                          
Net income per share - basic common stock $ 0.26 $ 0.26 $ 0.38 $ 0.13 $ 0.20 $ 0.14 $ 0.18 $ 0.08 $ 0.50 $ 0.76 $ 1.02 $ 0.60 $ 0.33
Net income per share - diluted common stock $ 0.25 $ 0.25 $ 0.36 $ 0.12 $ 0.19 $ 0.13 $ 0.17 $ 0.08 $ 0.48 $ 0.73 $ 0.97 $ 0.56 $ 0.30
Weighted-average number of shares used in calculating net income per share attributable to common stockholders:                          
Basic common shares 20,310,857 20,157,688 19,972,395 19,827,669 19,689,662 19,428,653 19,310,064 19,167,585 19,900,032 19,986,544 20,067,152 19,398,991 16,182,569
Diluted common shares 21,362,513 21,182,587 20,997,429 20,840,367 20,812,773 20,783,550 20,672,414 20,562,040 20,931,802 21,000,945 21,095,867 20,708,170 18,037,498