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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 Income (Loss) | Accumulated Deficit
--- | --- | --- | --- | --- | ---
Begining balance at Dec. 31, 2016 | $ 314,877 | $ 87 | $ 1,371,432 | $ (318) | $ (1,056,324)
Begining balance (in shares) at Dec. 31, 2016 |  | 86,883 |  |  |
Net income (loss) | (142,542) |  |  |  | (142,542)
Unrealized gain (loss) on marketable securities | (1,532) |  |  | (1,532) |
Share-based compensation expense | 42,522 |  | 42,522 |  |
Issuance of common stock for vested restricted stock units | 1 | $ 1 |  |  |
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 |  |
Issuance of common stock for stock option exercises (in shares) | 1,353 | 1,349 |  |  |
Equity component of convertible debt, net | $ 144,948 |  | 144,948 |  |
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 |  |  |  | 21,111
Unrealized gain (loss) on marketable securities | (82) |  |  | (82) |
Share-based compensation expense | 58,068 |  | 58,068 |  |
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 |  |
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 |  |  |
Net income (loss) | 37,012 |  |  |  | 37,012
Unrealized gain (loss) on marketable securities | 3,345 |  |  | 3,345 |
Share-based compensation expense | 75,262 |  | 75,262 |  |
Cumulative-effect adjustment to equity due toadoption of ASU 2016-02 | ASU 2016-02 | 8,043 |  |  |  | 8,043
Issuance of common stock for vested restricted stock units (in shares) |  | 416 |  |  |
Issuance of common stock for stock option exercises | $ 27,313 | $ 1 | 27,312 |  |
Issuance of common stock for stock option exercises (in shares) | 983 | 981 |  |  |
Issuance of common stock for employee stockpurchase plan | $ 5,183 |  | 5,183 |  |
Issuance of common stock for employee stock purchase plan (in shares) |  | 78 |  |  |
Ending balance at Dec. 31, 2019 | $ 636,923 | $ 92 | $ 1,768,118 | $ 1,413 | $ (1,132,700)
Ending balance (in shares) at Dec. 31, 2019 |  | 92,272 |  |  |

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