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Shareholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2019
Equity [Abstract] |
Schedule of Stockholders Equity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Additional | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Common | ​ | Paid-In | ​ | Accumulated | ​ | ​ | ​
​ |  | Stock |  | Capital |  | Deficit | ​ | Total
​ | ​ | ​ | (In thousands)
Balance January 1, 2019 | ​ | $ | 490 | ​ | $ | 549,479 | ​ | $ | (650,125) | ​ | $ | (100,156)
Exercise of stock options | ​ | ​ | — | ​ | ​ | 108 | ​ | ​ | — | ​ | ​ | 108
Stock-based compensation expense | ​ | ​ | — | ​ | ​ | 3,374 | ​ | ​ | — | ​ | ​ | 3,374
Net loss | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (24,345) | ​ | ​ | (24,345)
Balance March 31, 2019 | ​ | ​ | 490 | ​ | ​ | 552,961 | ​ | ​ | (674,470) | ​ | ​ | (121,019)
Exercise of stock options | ​ | ​ | 2 | ​ | ​ | 1,598 | ​ | ​ | — | ​ | ​ | 1,600
Stock-based compensation expense | ​ | ​ | — | ​ | ​ | 3,598 | ​ | ​ | — | ​ | ​ | 3,598
Net loss | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (14,453) | ​ | ​ | (14,453)
Balance June 30, 2019 | ​ | ​ | 492 | ​ | ​ | 558,157 | ​ | ​ | (688,923) | ​ | ​ | (130,274)
Exercise of stock options | ​ | ​ | 3 | ​ | ​ | 3,323 | ​ | ​ | — | ​ | ​ | 3,326
Stock-based compensation expense | ​ | ​ | — | ​ | ​ | 3,496 | ​ | ​ | — | ​ | ​ | 3,496
Net loss | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (16,463) | ​ | ​ | (16,463)
Balance September 30, 2019 | ​ | $ | 495 | ​ | $ | 564,976 | ​ | $ | (705,386) | ​ | $ | (139,915)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Additional | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Common | ​ | Paid-In | ​ | Accumulated | ​ | ​ | ​
​ |  | Stock |  | Capital |  | Deficit | ​ | Total
​ | ​ | ​ | (In thousands)
Balance January 1, 2018 | ​ | $ | 482 | ​ | $ | 520,072 | ​ | $ | (523,368) | ​ | $ | (2,814)
Exercise of stock options | ​ | ​ | 1 | ​ | ​ | 686 | ​ | ​ | — | ​ | ​ | 687
Stock-based compensation expense | ​ | ​ | — | ​ | ​ | 2,966 | ​ | ​ | — | ​ | ​ | 2,966
Net loss | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (30,054) | ​ | ​ | (30,054)
Balance March 31, 2018 | ​ | ​ | 483 | ​ | ​ | 523,724 | ​ | ​ | (553,422) | ​ | ​ | (29,215)
Warrants issued | ​ | ​ | — | ​ | ​ | 1,424 | ​ | ​ | — | ​ | ​ | 1,424
Exercise of stock options | ​ | ​ | 2 | ​ | ​ | 2,188 | ​ | ​ | — | ​ | ​ | 2,190
Stock-based compensation expense | ​ | ​ | — | ​ | ​ | 3,000 | ​ | ​ | — | ​ | ​ | 3,000
Net loss | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (33,697) | ​ | ​ | (33,697)
Balance June 30, 2018 | ​ | ​ | 485 | ​ | ​ | 530,336 | ​ | ​ | (587,119) | ​ | ​ | (56,298)
Exercise of stock options | ​ | ​ | 5 | ​ | ​ | 3,839 | ​ | ​ | — | ​ | ​ | 3,844
Stock-based compensation expense | ​ | ​ | — | ​ | ​ | 2,929 | ​ | ​ | — | ​ | ​ | 2,929
Net loss | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (39,472) | ​ | ​ | (39,472)
Balance September 30, 2018 | ​ | $ | 490 | ​ | $ | 537,104 | ​ | $ | (626,591) | ​ | $ | (88,997)

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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