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Equity (Tables) | 6 Months Ended
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Jun. 30, 2019
Equity |
Schedule of Stockholders' Equity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | 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, 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, 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
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | 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, 2017 |  | 48,229 | ​ | $ | 482 | ​ | ​ | 85 | ​ | $ | (1,284) | ​ | $ | 1,051,953 | ​ | $ | (212,870) | ​ | $ | 1,812 | ​ | $ | 840,093
Net loss |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (15,827) | ​ |  | — | ​ |  | (15,827)
Other comprehensive income, net of tax |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 24 | ​ |  | 24
Share-based compensation expense |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 4,537 | ​ |  | — | ​ |  | — | ​ |  | 4,537
Net issuance under employee stock plans | ​ | 462 | ​ | ​ | 5 | ​ | ​ | (115) | ​ | ​ | 1,728 | ​ | ​ | (2,159) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (426)
Purchases of common stock | ​ | — | ​ |  | — | ​ |  | 30 | ​ |  | (444) | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (444)
Balance at March 31, 2018 |  | 48,691 | ​ | $ | 487 | ​ | ​ | — | ​ | $ | — | ​ | $ | 1,054,331 | ​ | $ | (228,697) | ​ | $ | 1,836 | ​ | $ | 827,957
Net loss |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (237,634) | ​ |  | — | ​ |  | (237,634)
Other comprehensive income, net of tax |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (24) | ​ |  | (24)
Share-based compensation expense |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 4,904 | ​ |  | — | ​ |  | — | ​ |  | 4,904
Net issuance under employee stock plans | ​ | 43 | ​ | ​ | — | ​ | ​ | (57) | ​ | ​ | 865 | ​ | ​ | (1,273) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (408)
Purchases of common stock | ​ | — | ​ |  | — | ​ |  | 57 | ​ | ​ | (865) | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (865)
Balance at June 30, 2018 |  | 48,734 | ​ | $ | 487 | ​ | ​ | — | ​ | $ | — | ​ | $ | 1,057,962 | ​ | $ | (466,331) | ​ | $ | 1,812 | ​ | $ | 593,930
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, 2018 | ​ | $ | 1,836 | ​ | $ | (16) | ​ | $ | 1,820
Other comprehensive income (loss) | ​ |  | 13 | ​ |  | 45 | ​ |  | 58
Balance - June 30, 2019 | ​ | $ | 1,849 | ​ | $ | 29 | ​ | $ | 1,878

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