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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands | Total | Common Stock (Class A and B) | Additional Paid-in-Capital | Accumulated Other Comprehensive Income | Accumulated Deficit
--- | --- | --- | --- | --- | ---
Shares outstanding, beginning of the period (in shares) at Dec. 31, 2014 |  | 39,641,000 |  |  |
Beginning of the period at Dec. 31, 2014 | $ 55,819 | $ 39 | $ 189,168 | $ 147 | $ (133,535)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Stock-based compensation expense | 11,000 |  | 11,000 |  |
Grant of restricted stock award (in shares) |  | 600,000 |  |  |
Issuance of common stock upon exercise of stock options (in shares) |  | 707,000 |  |  |
Issuance of common stock upon exercise of stock options | 2,244 | $ 2 | 2,242 |  |
Net loss | (43,399) |  |  |  | (43,399)
Distribution to members | (35) |  | (35) |  |
Cost of offering | (4) |  | (4) |  |
Other comprehensive income (loss) | 94 |  |  | 94 |
Shares outstanding, end of the period (in shares) at Dec. 31, 2015 |  | 40,948,000 |  |  |
End of the period at Dec. 31, 2015 | 25,719 | $ 41 | 202,371 | 241 | (176,934)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Stock-based compensation expense | 14,247 |  | 14,247 |  |
Issuance of common stock upon exercise of stock options (in shares) |  | 374,000 |  |  |
Issuance of common stock upon exercise of stock options | 1,597 |  | 1,597 |  |
Tax withholdings related to net share settlements of stock-based compensation awards (in shares) |  | (61,000) |  |  |
Tax withholdings related to net share settlements of stock-based compensation awards | (761) |  | (761) |  |
Net loss | (43,977) |  |  |  | (43,977)
Other comprehensive income (loss) | 50 |  |  | 50 |
Shares outstanding, end of the period (in shares) at Dec. 31, 2016 |  | 41,261,000 |  |  |
End of the period at Dec. 31, 2016 | (3,125) | $ 41 | 217,454 | 291 | (220,911)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Stock-based compensation expense | $ 19,476 |  | 19,476 |  |
Grant of restricted stock award (in shares) |  | 30,000 |  |  |
Issuance of common stock upon exercise of stock options (in shares) | 1,158,820 | 1,159,000 |  |  |
Issuance of common stock upon exercise of stock options | $ 12,485 | $ 1 | 12,484 |  |
Tax withholdings related to net share settlements of stock-based compensation awards (in shares) |  | (81,000) |  |  |
Tax withholdings related to net share settlements of stock-based compensation awards | (1,125) |  | (1,125) |  |
Net loss | (44,426) |  |  |  | (44,426)
Other comprehensive income (loss) | (219) |  |  | (219) |
Shares outstanding, end of the period (in shares) at Dec. 31, 2017 |  | 42,369,000 |  |  |
End of the period at Dec. 31, 2017 | $ (16,934) | $ 42 | $ 248,289 | $ 72 | $ (265,337)

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