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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Accumulated Deficit | Accumulated Other Comprehensive Income | Convertible Senior Notes Due 2019 | Convertible Senior Notes Due 2019 Additional Paid-In Capital | Convertible Senior Notes Due 2022 | Convertible Senior Notes Due 2022 Additional Paid-In Capital
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Cumulative effect adjustment of the adoption of Accounting Standards Update 2016-09 (Note 2) |  |  | $ 287 | $ (287) |  |  |  |  |
Balances (in shares) at Dec. 31, 2016 |  | 37,481,000 |  |  |  |  |  |  |
Balances at Dec. 31, 2016 | $ 218,976 | $ 37 | 565,207 | (346,238) | $ (30) |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Exercise of stock options (in shares) |  | 214,000 |  |  |  |  |  |  |
Exercise of stock options | 2,613 |  | 2,613 |  |  |  |  |  |
Vested restricted stock units (in shares) |  | 97,000 |  |  |  |  |  |  |
Vested restricted stock units | $ 0 | $ 0 |  |  |  |  |  |  |
Shares issued under employee stock purchase plan (in shares) | 35,745 | 36,000 |  |  |  |  |  |  |
Shares issued under employee stock purchase plan | $ 1,056 |  | 1,056 |  |  |  |  |  |
Stock-based compensation | 14,744 |  | 14,744 |  |  |  |  |  |
Issuance of common stock upon conversion of 2019 convertible senior notes (in shares) |  | 2,490,000 |  |  |  |  |  |  |
Issuance of common stock upon conversion of 2019 convertible senior notes | 120,960 | $ 3 | 120,957 |  |  |  |  |  |
Retirement of equity component of 2019 convertible senior notes | 70,930 |  |  |  |  | $ (126,326) | $ (126,326) | $ 68,668 | $ 68,668
Net unrealized gain (loss) on investments | (34) |  |  |  | (34) |  |  |  |
Net loss | (39,609) |  |  | (39,609) |  |  |  |  |
Balances (in shares) at Jun. 30, 2017 |  | 40,318,000 |  |  |  |  |  |  |
Balances at Jun. 30, 2017 | $ 261,048 | $ 40 | $ 647,206 | $ (386,134) | $ (64) |  |  |  |

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