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Condensed 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, 2017 | $ 372,138 | $ 89 | $ 1,572,765 | $ (1,850) | $ (1,198,866)
Begining balance (in shares) at Dec. 31, 2017 |  | 88,794 |  |  |
Net income (loss) | (41,818) |  |  |  | (41,818)
Unrealized gain (loss) on investments in available-for-sale debt securities, net of tax | (1,847) |  |  | (1,847) |
Share-based compensation expense | 19,879 |  | 19,879 |  |
Issuance of common stock for vested restricted stock units (in shares) |  | 343 |  |  |
Issuance of common stock for stock option exercises | 16,135 | $ 1 | 16,134 |  |
Issuance of common stock for stock option exercises (in shares) |  | 745 |  |  |
Ending balance at Mar. 31, 2018 | 364,487 | $ 90 | 1,608,778 | (3,697) | (1,240,684)
Ending balance (in shares) at Mar. 31, 2018 |  | 89,882 |  |  |
Begining balance at Dec. 31, 2017 | 372,138 | $ 89 | 1,572,765 | (1,850) | (1,198,866)
Begining balance (in shares) at Dec. 31, 2017 |  | 88,794 |  |  |
Net income (loss) | (47,731) |  |  |  |
Ending balance at Jun. 30, 2018 | 377,436 | $ 90 | 1,626,752 | (2,809) | (1,246,597)
Ending balance (in shares) at Jun. 30, 2018 |  | 90,403 |  |  |
Begining balance at Mar. 31, 2018 | 364,487 | $ 90 | 1,608,778 | (3,697) | (1,240,684)
Begining balance (in shares) at Mar. 31, 2018 |  | 89,882 |  |  |
Net income (loss) | (5,913) |  |  |  | (5,913)
Unrealized gain (loss) on investments in available-for-sale debt securities, net of tax | 888 |  |  | 888 |
Share-based compensation expense | 11,851 |  | 11,851 |  |
Issuance of common stock for vested restricted stock units (in shares) |  | 73 |  |  |
Issuance of common stock for stock option exercises | 6,123 |  | 6,123 |  |
Issuance of common stock for stock option exercises (in shares) |  | 448 |  |  |
Ending balance at Jun. 30, 2018 | 377,436 | $ 90 | 1,626,752 | (2,809) | (1,246,597)
Ending balance (in shares) at Jun. 30, 2018 |  | 90,403 |  |  |
Begining balance at Dec. 31, 2018 | 480,765 | $ 91 | 1,660,361 | (1,932) | (1,177,755)
Begining balance (in shares) at Dec. 31, 2018 |  | 90,797 |  |  |
Net income (loss) | (102,115) |  |  |  | (102,115)
Unrealized gain (loss) on investments in available-for-sale debt securities, net of tax | 1,699 |  |  | 1,699 |
Share-based compensation expense | 15,764 |  | 15,764 |  |
Cumulative-effect adjustment to equity due to adoptionof ASU 2016-02 | ASU 2016-02 | 8,043 |  |  |  | 8,043
Issuance of common stock for vested restricted stock units (in shares) |  | 353 |  |  |
Issuance of common stock for stock option exercises | 2,581 |  | 2,581 |  |
Issuance of common stock for stock option exercises (in shares) |  | 95 |  |  |
Issuance of common stock for employee stock purchase plan | 2,538 |  | 2,538 |  |
Issuance of common stock for employee stock purchase plan (in shares) |  | 39 |  |  |
Ending balance at Mar. 31, 2019 | 409,275 | $ 91 | 1,681,244 | (233) | (1,271,827)
Ending balance (in shares) at Mar. 31, 2019 |  | 91,284 |  |  |
Begining balance at Dec. 31, 2018 | 480,765 | $ 91 | 1,660,361 | (1,932) | (1,177,755)
Begining balance (in shares) at Dec. 31, 2018 |  | 90,797 |  |  |
Net income (loss) | (50,777) |  |  |  |
Ending balance at Jun. 30, 2019 | 483,706 | $ 92 | 1,703,458 | 645 | (1,220,489)
Ending balance (in shares) at Jun. 30, 2019 |  | 91,536 |  |  |
Begining balance at Mar. 31, 2019 | 409,275 | $ 91 | 1,681,244 | (233) | (1,271,827)
Begining balance (in shares) at Mar. 31, 2019 |  | 91,284 |  |  |
Net income (loss) | 51,338 |  |  |  | 51,338
Unrealized gain (loss) on investments in available-for-sale debt securities, net of tax | 878 |  |  | 878 |
Share-based compensation expense | 17,931 |  | 17,931 |  |
Issuance of common stock for vested restricted stock units (in shares) |  | 39 |  |  |
Issuance of common stock for stock option exercises | 4,284 | $ 1 | 4,283 |  |
Issuance of common stock for stock option exercises (in shares) |  | 213 |  |  |
Ending balance at Jun. 30, 2019 | $ 483,706 | $ 92 | $ 1,703,458 | $ 645 | $ (1,220,489)
Ending balance (in shares) at Jun. 30, 2019 |  | 91,536 |  |  |

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