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Equity (Tables) | 3 Months Ended
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Mar. 31, 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
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | 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
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) | ​ |  | (3) | ​ |  | (819) | ​ |  | (822)
Balance - March 31, 2022 | ​ | $ | 1,811 | ​ | $ | (1,150) | ​ | $ | 661

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