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Equity (Tables) | 6 Months Ended
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Jun. 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 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 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 | ​ | ​ | 3 | ​ | ​ | 752 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 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 | ​ | $ | 497 | ​ | $ | 1,100,716 | ​ | $ | (707,799) | ​ | $ | 1,917 | ​ | $ | 395,331
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | 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 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 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
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) | ​ |  | (30) | ​ |  | 53 | ​ |  | 23
Balance - June 30, 2020 | ​ | $ | 1,831 | ​ | $ | 86 | ​ | $ | 1,917

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