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Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - 9 months ended Sep. 30, 2017 - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock Class A common stock | Common Stock Class B common stock | Additional Paid-in Capital | Accumulated Other Comprehensive (Loss)/Income | Accumulated Deficit
--- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2016 |  | 11,691 | 22,028 |  |  |
Beginning balance at Dec. 31, 2016 | $ 69,682 | $ 1 | $ 3 | $ 146,692 | $ (51) | $ (76,963)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options (in shares) | 133 | 133 |  |  |  |
Exercise of stock options | $ 508 |  |  | 508 |  |
Stock-based compensation | 4,674 |  |  | 4,674 |  |
Vesting of restricted stock units, net of shares withheld for taxes (in shares) |  | 81 |  |  |  |
Vesting of restricted stock units, net of shares withheld for taxes | (1,421) |  |  | (1,421) |  |
Vesting of early exercised shares | 67 |  |  | 67 |  |
Conversion of Class B stock to Class A stock (in shares) |  | 2,580 | (2,580) |  |  |
Conversion of Class B stock to Class A stock | 0 |  |  |  |  |
Issuance of restricted stock awards (in shares) |  | 9 |  |  |  |
Other comprehensive income | 28 |  |  |  | 28 |
Net income | 7,139 |  |  |  |  | 7,139
Ending balance (in shares) at Sep. 30, 2017 |  | 14,494 | 19,448 |  |  |
Ending balance at Sep. 30, 2017 | $ 80,677 | $ 1 | $ 3 | $ 150,520 | $ (23) | $ (69,824)

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