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Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid in Capital | Accumulated Other Comprehensive (Loss) Gain | Accumulated Deficit
--- | --- | --- | --- | --- | ---
Begining balance at Dec. 31, 2015 | $ 424,454 | $ 86 | $ 1,340,579 | $ (977) | $ (915,234)
Begining balance (in shares) at Dec. 31, 2015 |  | 86,263 |  |  |
Net income (loss) | (141,090) | $ 0 | 0 | 0 | (141,090)
Unrealized gains (losses) on available for sale investments | 659 | 0 | 0 | 659 | 0
Share-based compensation expense | 28,464 | 0 | 28,464 | 0 | 0
Issuance of common stock for vested restricted stock units | 0 | $ 0 | 0 | 0 | 0
Issuance of common stock for vested restricted stock units (in shares) |  | 284 |  |  |
Issuance of common stock for stock option exercises | $ 2,390 | $ 1 | 2,389 | 0 | 0
Issuance of common stock for stock option exercises (in shares) | 341 | 336 |  |  |
Ending balance at Dec. 31, 2016 | $ 314,877 | $ 87 | 1,371,432 | (318) | (1,056,324)
Ending balance (in shares) at Dec. 31, 2016 |  | 86,883 |  |  |
Net income (loss) | (142,542) | $ 0 | 0 | 0 | (142,542)
Unrealized gains (losses) on available for sale investments | (1,532) | 0 | 0 | (1,532) | 0
Share-based compensation expense | 42,522 | 0 | 42,522 | 0 | 0
Issuance of common stock for vested restricted stock units | 1 | $ 1 | 0 | 0 | 0
Issuance of common stock for vested restricted stock units (in shares) |  | 562 |  |  |
Issuance of common stock for stock option exercises | $ 13,864 | $ 1 | 13,863 | 0 | 0
Issuance of common stock for stock option exercises (in shares) | 1,353 | 1,349 |  |  |
Equity component of convertible debt, net of issuance costs | $ 144,948 | $ 0 | 144,948 | 0 | 0
Ending balance at Dec. 31, 2017 | 372,138 | $ 89 | 1,572,765 | (1,850) | (1,198,866)
Ending balance (in shares) at Dec. 31, 2017 |  | 88,794 |  |  |
Net income (loss) | 21,111 | $ 0 | 0 | 0 | 21,111
Unrealized gains (losses) on available for sale investments | (82) | 0 | 0 | (82) | 0
Share-based compensation expense | 58,068 | 0 | 58,068 | 0 | 0
Issuance of common stock for vested restricted stock units | 0 | $ 0 | 0 | 0 | 0
Issuance of common stock for vested restricted stock units (in shares) |  | 429 |  |  |
Issuance of common stock for stock option exercises | $ 29,530 | $ 2 | 29,528 | 0 | 0
Issuance of common stock for stock option exercises (in shares) | 1,592 | 1,574 |  |  |
Ending balance at Dec. 31, 2018 | $ 480,765 | $ 91 | $ 1,660,361 | $ (1,932) | $ (1,177,755)
Ending balance (in shares) at Dec. 31, 2018 |  | 90,797 |  |  |

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