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Equity (Tables) | 9 Months Ended
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Sep. 30, 2020
Stockholders' Equity |
Schedule of Stockholders' Equity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | Accumulated |  | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Additional | ​ | ​ | ​ | ​ | Other | ​ | ​ | ​
​ | ​ | Common Stock | ​ | Paid-in | ​ | Accumulated | ​ | Comprehensive | ​ | ​ | ​
​ | ​ | Shares | ​ | Amount | ​ | Capital | ​ | Deficit | ​ | Income | ​ | Total
​ | ​ | (in thousands)
Balance at December 31, 2019 |  | 48,994 | ​ | $ | 490 | ​ | $ | 1,071,058 | ​ | $ | (698,930) | ​ | $ | 1,894 | ​ | $ | 374,512
Net income (loss) |  | — | ​ |  | — | ​ |  | — | ​ |  | (567) | ​ |  | — | ​ |  | (567)
Other comprehensive income (loss), net of tax |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 153 | ​ |  | 153
Share-based compensation expense |  | — | ​ |  | — | ​ |  | 3,646 | ​ |  | — | ​ |  | — | ​ |  | 3,646
Net issuance under employee stock plans |  | 434 | ​ | ​ | 4 | ​ | ​ | (684) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (680)
Balance at March 31, 2020 |  | 49,428 | ​ | $ | 494 | ​ | $ | 1,074,020 | ​ | $ | (699,497) | ​ | $ | 2,047 | ​ | $ | 377,064
Net income (loss) |  | — | ​ |  | — | ​ |  | — | ​ |  | (8,302) | ​ |  | — | ​ |  | (8,302)
Other comprehensive income (loss), net of tax |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (130) | ​ |  | (130)
Share-based compensation expense |  | — | ​ |  | — | ​ |  | 2,974 | ​ |  | — | ​ |  | — | ​ |  | 2,974
Net issuance under employee stock plans |  | 191 | ​ | ​ | 2 | ​ | ​ | 753 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 755
Extinguishment of equity component of repurchased 2023 Notes | ​ | — | ​ | ​ | — | ​ | ​ | (80) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (80)
Equity component of 2027 Notes | ​ | — | ​ | ​ | — | ​ | ​ | 33,363 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 33,363
Purchase of capped calls | ​ | — | ​ | ​ | — | ​ | ​ | (10,313) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (10,313)
Balance at June 30, 2020 |  | 49,619 | ​ | $ | 496 | ​ | $ | 1,100,717 | ​ | $ | (707,799) | ​ | $ | 1,917 | ​ | $ | 395,331
Net income (loss) |  | — | ​ |  | — | ​ |  | — | ​ |  | 580 | ​ |  | — | ​ |  | 580
Other comprehensive income, net of tax |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (60) | ​ |  | (60)
Share-based compensation expense |  | — | ​ |  | — | ​ |  | 2,942 | ​ |  | — | ​ |  | — | ​ |  | 2,942
Net issuance under employee stock plans |  | (7) | ​ | ​ | — | ​ | ​ | (700) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (700)
Balance at September 30, 2020 |  | 49,612 | ​ | $ | 496 | ​ | $ | 1,102,959 | ​ | $ | (707,219) | ​ | $ | 1,857 | ​ | $ | 398,093
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | Accumulated |  | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Additional | ​ | ​ | ​ | ​ | Other | ​ | ​ | ​
​ | ​ | Common Stock | ​ | Treasury Stock | ​ | Paid-in | ​ | Accumulated | ​ | Comprehensive | ​ | ​ | ​
​ | ​ | Shares | ​ | Amount | ​ | Shares |  | Amount | ​ | Capital | ​ | Deficit | ​ | Income | ​ | Total
​ | ​ | (in thousands)
Balance at December 31, 2018 |  | 48,547 | ​ | $ | 485 | ​ | ​ | 523 | ​ | $ | (5,872) | ​ | $ | 1,061,325 | ​ | $ | (619,983) | ​ | $ | 1,820 | ​ | $ | 437,775
Net income (loss) |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (18,530) | ​ |  | — | ​ |  | (18,530)
Other comprehensive income (loss), net of tax |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 38 | ​ |  | 38
Share-based compensation expense |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 3,157 | ​ |  | — | ​ |  | — | ​ |  | 3,157
Net issuance under employee stock plans | ​ | 128 | ​ | ​ | 2 | ​ | ​ | (523) | ​ | ​ | 5,872 | ​ | ​ | (6,303) | ​ | ​ | (213) | ​ | ​ | — | ​ | ​ | (642)
Balance at March 31, 2019 |  | 48,675 | ​ | $ | 487 | ​ | ​ | — | ​ | $ | — | ​ | $ | 1,058,179 | ​ | $ | (638,726) | ​ | $ | 1,858 | ​ | $ | 421,798
Net income (loss) |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (15,565) | ​ |  | — | ​ |  | (15,565)
Other comprehensive income (loss), net of tax |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 20 | ​ |  | 20
Share-based compensation expense |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 4,588 | ​ |  | — | ​ |  | — | ​ |  | 4,588
Net issuance under employee stock plans | ​ | 296 | ​ | ​ | 3 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 182 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 185
Balance at June 30, 2019 |  | 48,971 | ​ | $ | 490 | ​ | ​ | — | ​ | $ | — | ​ | $ | 1,062,949 | ​ | $ | (654,291) | ​ | $ | 1,878 | ​ | $ | 411,026
Net income (loss) |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (11,767) | ​ |  | — | ​ |  | (11,767)
Other comprehensive income, net of tax |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (42) | ​ |  | (42)
Share-based compensation expense |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 3,783 | ​ |  | — | ​ |  | — | ​ |  | 3,783
Net issuance under employee stock plans | ​ | (68) | ​ | ​ | (1) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (529) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (530)
Balance at September 30, 2019 |  | 48,903 | ​ | $ | 489 | ​ | ​ | — | ​ | $ | — | ​ | $ | 1,066,203 | ​ | $ | (666,058) | ​ | $ | 1,836 | ​ | $ | 402,470
Schedule of the changes in the balances of each component of AOCI, net of tax | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Unrealized | ​ | ​ | ​
​ | ​ | ​ | ​ | Gains (Losses) | ​ | ​ | ​
​ | ​ | Foreign | ​ | on Available | ​ | ​ | ​
​ | ​ | Currency | ​ | for Sale | ​ | ​ | ​
​ |  | Translation |  | Securities |  | Total
​ | ​ | (in thousands)
Balance - December 31, 2019 | ​ | $ | 1,861 | ​ | $ | 33 | ​ | $ | 1,894
Other comprehensive income (loss) | ​ |  | (21) | ​ |  | (16) | ​ |  | (37)
Balance - September 30, 2020 | ​ | $ | 1,840 | ​ | $ | 17 | ​ | $ | 1,857

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