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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Treasury Stock | Additional Paid-In Capital | Accumulated Deficit | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2015 | $ 313,337 | $ 343 | $ 0 | $ 547,185 | $ (234,186) | $ (5)
Balance (in shares) at Dec. 31, 2015 |  | 34,345,754 | 0 |  |  |
Share-based compensation | 12,165 |  |  | 12,165 |  |
Stock plan related activity | 1,854 | $ 6 | $ (39) | 1,887 |  |
Stock plan related activity (in shares) |  | 524,853 | 1,862 |  |  |
Retirement of treasury stock | 0 |  | $ 39 | (39) |  |
Retirement of treasury stock (in shares) |  |  | (1,862) |  |  |
Unrealized gain on investments | (77) |  |  |  |  | (77)
Net loss | (58,528) |  |  |  | (58,528) |
Balance at Dec. 31, 2016 | 268,751 | $ 349 | $ 0 | 561,198 | (292,714) | (82)
Balance (in shares) at Dec. 31, 2016 |  | 34,870,607 | 0 |  |  |
Share-based compensation | 14,744 |  |  | 14,744 |  |
Issuance of common stock, net of offering costs | 34,244 | $ 17 |  | 34,227 |  |
Issuance of common stock, net of offering costs (in shares) |  | 1,699,284 |  |  |  |
Stock plan related activity | 1,104 | $ 3 | $ (40) | 1,141 |  |
Stock plan related activity (in shares) |  | 289,186 | 1,862 |  |  |
Retirement of treasury stock | 0 |  | $ 40 | (40) |  |
Retirement of treasury stock (in shares) |  |  | (1,862) |  |  |
Unrealized gain on investments | 21 |  |  |  |  | 21
Net loss | (19,626) |  |  |  | (19,626) |
Balance at Dec. 31, 2017 | 299,238 | $ 369 | $ 0 | 611,270 | (312,340) | (61)
Balance (in shares) at Dec. 31, 2017 |  | 36,859,077 | 0 |  |  |
Cumulative effect of adoption of accounting standards |  |  |  |  | (6,478) |
Share-based compensation | 16,520 |  |  | 16,520 |  |
Issuance of common stock, net of offering costs | 103,259 | $ 52 |  | 103,207 |  |
Issuance of common stock, net of offering costs (in shares) |  | 5,175,000 |  |  |  |
Stock plan related activity | 1,733 | $ 3 | $ (260) | 1,990 |  |
Stock plan related activity (in shares) |  | 319,224 | 11,070 |  |  |
Retirement of treasury stock | 0 |  | $ 260 | (260) |  |
Retirement of treasury stock (in shares) |  |  | (11,070) |  |  |
Unrealized gain on investments | 58 |  |  |  |  | 58
Net loss | (171,453) |  |  |  | (171,453) |
Balance at Dec. 31, 2018 | 242,877 | $ 424 | $ 0 | $ 732,727 | $ (490,271) | $ (3)
Balance (in shares) at Dec. 31, 2018 |  | 42,353,301 | 0 |  |  |
Cumulative effect of adoption of accounting standards | $ (6,478) |  |  |  |  |

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