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Equity (Tables) | 9 Months Ended
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Sep. 30, 2022
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, 2021 |  | 50,653 | ​ | $ | 507 | ​ | $ | 1,116,921 | ​ | $ | (681,283) | ​ | $ | 1,483 | ​ | $ | 437,628
Cumulative effect of change in accounting principle - adoption of ASU 2020-06 | ​ | — | ​ |  | — | ​ |  | (56,801) | ​ |  | 12,541 | ​ |  | — | ​ |  | (44,260)
Net income |  | — | ​ |  | — | ​ |  | — | ​ |  | 13,330 | ​ |  | — | ​ |  | 13,330
Other comprehensive income (loss), net of tax |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (822) | ​ |  | (822)
Share-based compensation expense |  | — | ​ |  | — | ​ |  | 4,481 | ​ |  | — | ​ |  | — | ​ |  | 4,481
Net issuance under employee stock plans |  | 590 | ​ | ​ | 6 | ​ | ​ | (6,793) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (6,787)
Balance at March 31, 2022 |  | 51,243 | ​ | $ | 513 | ​ | $ | 1,057,808 | ​ | $ | (655,412) | ​ | $ | 661 | ​ | $ | 403,570
Net income |  | — | ​ |  | — | ​ |  | — | ​ |  | 9,655 | ​ |  | — | ​ |  | 9,655
Other comprehensive income (loss), net of tax |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (272) | ​ |  | (272)
Share-based compensation expense |  | — | ​ |  | — | ​ |  | 6,278 | ​ |  | — | ​ |  | — | ​ |  | 6,278
Net issuance under employee stock plans |  | 182 | ​ | ​ | 2 | ​ | ​ | 1,504 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,506
Balance at June 30, 2022 |  | 51,425 | ​ | $ | 515 | ​ | $ | 1,065,590 | ​ | $ | (645,757) | ​ | $ | 389 | ​ | $ | 420,737
Net income (loss) |  | — | ​ |  | — | ​ |  | — | ​ |  | 15,041 | ​ |  | — | ​ |  | 15,041
Other comprehensive income (loss), net of tax |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (170) | ​ |  | (170)
Share-based compensation expense |  | — | ​ |  | — | ​ |  | 6,210 | ​ |  | — | ​ |  | — | ​ |  | 6,210
Net issuance under employee stock plans |  | (5) | ​ | ​ | — | ​ | ​ | (703) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (703)
Balance at September 30, 2022 |  | 51,420 | ​ | $ | 515 | ​ | $ | 1,071,097 | ​ | $ | (630,716) | ​ | $ | 219 | ​ | $ | 441,115
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | Accumulated |  | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Additional | ​ | ​ | ​ | ​ | Other | ​ | ​ | ​
​ | ​ | Common Stock | ​ | Paid-in | ​ | Accumulated | ​ | Comprehensive | ​ | ​ | ​
​ | ​ | Shares | ​ | Amount | ​ | Capital | ​ | Deficit | ​ | Income | ​ | Total
​ | ​ | (in thousands)
Balance at December 31, 2020 |  | 49,724 | ​ | $ | 497 | ​ | $ | 1,113,352 | ​ | $ | (707,321) | ​ | $ | 1,846 | ​ | $ | 408,374
Net income |  | — | ​ |  | — | ​ |  | — | ​ |  | 2,494 | ​ |  | — | ​ |  | 2,494
Other comprehensive income (loss), net of tax |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (19) | ​ |  | (19)
Share-based compensation expense |  | — | ​ |  | — | ​ |  | 3,237 | ​ |  | — | ​ |  | — | ​ |  | 3,237
Net issuance under employee stock plans | ​ | 459 | ​ | ​ | 5 | ​ | ​ | (1,630) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (1,625)
Balance at March 31, 2021 |  | 50,183 | ​ | $ | 502 | ​ | $ | 1,114,959 | ​ | $ | (704,827) | ​ | $ | 1,827 | ​ | $ | 412,461
Net income |  | — | ​ |  | — | ​ |  | — | ​ |  | 6,348 | ​ |  | — | ​ |  | 6,348
Other comprehensive income (loss), net of tax |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (24) | ​ |  | (24)
Share-based compensation expense |  | — | ​ |  | — | ​ |  | 4,367 | ​ |  | — | ​ |  | — | ​ |  | 4,367
Net issuance under employee stock plans | ​ | 166 | ​ | ​ | 1 | ​ | ​ | 582 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 583
Balance at June 30, 2021 |  | 50,349 | ​ | $ | 503 | ​ | $ | 1,119,908 | ​ | $ | (698,479) | ​ | $ | 1,803 | ​ | $ | 423,735
Net income (loss) |  | — | ​ |  | — | ​ |  | — | ​ |  | 8,993 | ​ |  | — | ​ |  | 8,993
Other comprehensive income (loss), net of tax |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (33) | ​ |  | (33)
Share-based compensation expense |  | — | ​ |  | — | ​ |  | 4,131 | ​ |  | — | ​ |  | — | ​ |  | 4,131
Net issuance under employee stock plans | ​ | (28) | ​ | ​ | — | ​ | ​ | (1,513) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (1,513)
Balance at September 30, 2021 |  | 50,321 | ​ | $ | 503 | ​ | $ | 1,122,526 | ​ | $ | (689,486) | ​ | $ | 1,770 | ​ | $ | 435,313
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, 2021 | ​ | $ | 1,814 | ​ | $ | (331) | ​ | $ | 1,483
Other comprehensive income (loss) | ​ |  | (108) | ​ |  | (1,156) | ​ |  | (1,264)
Balance - September 30, 2022 | ​ | $ | 1,706 | ​ | $ | (1,487) | ​ | $ | 219

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