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Unaudited Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Class A Common Stock | Class B Common Stock | Common Stock Class A Common Stock | Common Stock Class B Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive (Loss) Income | Retained Earnings (Accumulated Deficit)
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2017 | $ 127,025 |  |  | $ 78 | $ 28 | $ 185,190 | $ 228 | $ (58,499)
Beginning balance, Shares at Dec. 31, 2017 |  |  |  | 77,884,754 | 28,226,104 |  |  |
Net income | 5,495 |  |  |  |  |  |  | 5,495
Stock–based compensation expense | 3,967 |  |  |  |  | 3,967 |  |
Issuance of common stock upon exercise of stock options | 80 |  |  |  |  | 80 |  |
Issuance of common stock upon exercise of stock options, Shares |  |  |  | 6,574 | 10,690 |  |  |
Cumulative adjustment from adoption of revenue recognition model | 3,042 |  |  |  |  |  |  | 3,042
Conversion of common stock |  |  |  | $ 7 |  |  |  |
Conversion of common stock, shares issued |  |  |  | 7,534,710 |  |  |  |
Conversion of common stock, shares converted |  |  |  |  | (7,534,710) |  |  |
Conversion of common stock, value |  |  |  |  | $ (7) |  |  |
Foreign currency translation adjustment | 72 |  |  |  |  |  | 72 |
Ending balance at Mar. 31, 2018 | 139,681 |  |  | $ 85 | $ 21 | 189,237 | 300 | (49,962)
Ending balance, Shares at Mar. 31, 2018 |  |  |  | 85,426,038 | 20,702,084 |  |  |
Beginning balance at Dec. 31, 2017 | 127,025 |  |  | $ 78 | $ 28 | 185,190 | 228 | (58,499)
Beginning balance, Shares at Dec. 31, 2017 |  |  |  | 77,884,754 | 28,226,104 |  |  |
Net income | 52,720 |  |  |  |  |  |  |
Foreign currency translation adjustment | (92) |  |  |  |  |  |  |
Ending balance at Sep. 30, 2018 | 179,139 |  |  | $ 89 | $ 21 | 181,630 | 136 | (2,737)
Ending balance, Shares at Sep. 30, 2018 |  |  |  | 89,261,069 | 20,702,084 |  |  |
Beginning balance at Mar. 31, 2018 | 139,681 |  |  | $ 85 | $ 21 | 189,237 | 300 | (49,962)
Beginning balance, Shares at Mar. 31, 2018 |  |  |  | 85,426,038 | 20,702,084 |  |  |
Net income | 33,343 |  |  |  |  |  |  | 33,343
Stock–based compensation expense | 5,666 |  |  |  |  | 5,666 |  |
Issuance of common stock upon exercise of stock options | 2,305 |  |  | $ 3 |  | 2,302 |  |
Issuance of common stock upon exercise of stock options, Shares |  |  |  | 2,466,744 |  |  |  |
Issuance of common stock upon vesting of restricted stock units |  |  |  | $ 1 |  | (1) |  |
Issuance of common stock upon vesting of restricted stock units, Shares |  |  |  | 1,261,495 |  |  |  |
Payment of withholding taxes and option costs on net share settlement of restricted stock units and stock options | (17,488) |  |  |  |  | (17,488) |  |
Payment of withholding taxes and option costs on net share settlement of restricted stock units and stock options, Shares |  |  |  | (471,470) |  |  |  |
Foreign currency translation adjustment | (152) |  |  |  |  |  | (152) |
Ending balance at Jun. 30, 2018 | 163,355 |  |  | $ 89 | $ 21 | 179,716 | 148 | (16,619)
Ending balance, Shares at Jun. 30, 2018 |  |  |  | 88,682,807 | 20,702,084 |  |  |
Net income | 13,882 |  |  |  |  |  |  | 13,882
Stock–based compensation expense | 5,617 |  |  |  |  | 5,617 |  |
Issuance of common stock upon exercise of stock options | 676 |  |  |  |  | 676 |  |
Issuance of common stock upon exercise of stock options, Shares |  |  |  | 411,731 |  |  |  |
Issuance of common stock upon vesting of restricted stock units, Shares |  |  |  | 260,464 |  |  |  |
Payment of withholding taxes and option costs on net share settlement of restricted stock units and stock options | (4,379) |  |  |  |  | (4,379) |  |
Payment of withholding taxes and option costs on net share settlement of restricted stock units and stock options, Shares |  |  |  | (93,933) |  |  |  |
Foreign currency translation adjustment | (12) |  |  |  |  |  | (12) |
Ending balance at Sep. 30, 2018 | 179,139 |  |  | $ 89 | $ 21 | 181,630 | 136 | (2,737)
Ending balance, Shares at Sep. 30, 2018 |  |  |  | 89,261,069 | 20,702,084 |  |  |
Beginning balance at Dec. 31, 2018 | 194,111 |  |  | $ 90 | $ 21 | 184,216 | 71 | 9,713
Beginning balance, Shares at Dec. 31, 2018 |  | 89,728,223 | 20,702,084 | 89,728,223 | 20,702,084 |  |  |
Net income | 12,584 |  |  |  |  |  |  | 12,584
Stock–based compensation expense | 7,995 |  |  |  |  | 7,995 |  |
Issuance of common stock upon exercise of stock options | 697 |  |  |  |  | 697 |  |
Issuance of common stock upon exercise of stock options, Shares |  |  |  | 447,210 |  |  |  |
Issuance of common stock upon vesting of restricted stock units, Shares |  |  |  | 297,374 |  |  |  |
Payment of withholding taxes and option costs on net share settlement of restricted stock units and stock options | (3,954) |  |  |  |  | (3,954) |  |
Payment of withholding taxes and option costs on net share settlement of restricted stock units and stock options, Shares |  |  |  | (102,034) |  |  |  |
Foreign currency translation adjustment | (424) |  |  |  |  |  | (424) |
Ending balance at Mar. 31, 2019 | 211,009 |  |  | $ 90 | $ 21 | 188,954 | (353) | 22,297
Ending balance, Shares at Mar. 31, 2019 |  |  |  | 90,370,773 | 20,702,084 |  |  |
Beginning balance at Dec. 31, 2018 | 194,111 |  |  | $ 90 | $ 21 | 184,216 | 71 | 9,713
Beginning balance, Shares at Dec. 31, 2018 |  | 89,728,223 | 20,702,084 | 89,728,223 | 20,702,084 |  |  |
Net income | 28,975 |  |  |  |  |  |  |
Foreign currency translation adjustment | (997) |  |  |  |  |  |  |
Ending balance at Sep. 30, 2019 | 237,102 |  |  | $ 91 | $ 21 | 199,228 | (926) | 38,688
Ending balance, Shares at Sep. 30, 2019 |  | 91,312,647 | 20,502,084 | 91,312,647 | 20,502,084 |  |  |
Beginning balance at Mar. 31, 2019 | 211,009 |  |  | $ 90 | $ 21 | 188,954 | (353) | 22,297
Beginning balance, Shares at Mar. 31, 2019 |  |  |  | 90,370,773 | 20,702,084 |  |  |
Net income | 6,007 |  |  |  |  |  |  | 6,007
Stock–based compensation expense | 9,260 |  |  |  |  | 9,260 |  |
Issuance of common stock upon exercise of stock options | 391 |  |  |  |  | 391 |  |
Issuance of common stock upon exercise of stock options, Shares |  |  |  | 133,838 |  |  |  |
Issuance of common stock upon vesting of restricted stock units |  |  |  | $ 1 |  | (1) |  |
Issuance of common stock upon vesting of restricted stock units, Shares |  |  |  | 362,447 |  |  |  |
Payment of withholding taxes and option costs on net share settlement of restricted stock units and stock options | (4,637) |  |  |  |  | (4,637) |  |
Payment of withholding taxes and option costs on net share settlement of restricted stock units and stock options, Shares |  |  |  | (122,137) |  |  |  |
Foreign currency translation adjustment | 356 |  |  |  |  |  | 356 |
Ending balance at Jun. 30, 2019 | 222,386 |  |  | $ 91 | $ 21 | 193,967 | 3 | 28,304
Ending balance, Shares at Jun. 30, 2019 |  |  |  | 90,744,921 | 20,702,084 |  |  |
Net income | 10,384 |  |  |  |  |  |  | 10,384
Stock–based compensation expense | 9,085 |  |  |  |  | 9,085 |  |
Issuance of common stock upon exercise of stock options | 368 |  |  |  |  | 368 |  |
Issuance of common stock upon exercise of stock options, Shares |  |  |  | 144,760 |  |  |  |
Issuance of common stock upon vesting of restricted stock units, Shares |  |  |  | 343,909 |  |  |  |
Payment of withholding taxes and option costs on net share settlement of restricted stock units and stock options | (4,192) |  |  |  |  | (4,192) |  |
Payment of withholding taxes and option costs on net share settlement of restricted stock units and stock options, Shares |  |  |  | (120,943) |  |  |  |
Conversion of common stock, shares issued |  |  |  | 200,000 |  |  |  |
Conversion of common stock, shares converted |  |  |  |  | (200,000) |  |  |
Foreign currency translation adjustment | (929) |  |  |  |  |  | (929) |
Ending balance at Sep. 30, 2019 | $ 237,102 |  |  | $ 91 | $ 21 | $ 199,228 | $ (926) | $ 38,688
Ending balance, Shares at Sep. 30, 2019 |  | 91,312,647 | 20,502,084 | 91,312,647 | 20,502,084 |  |  |

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