Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) |
Common Stock [Member] |
Additional Paid-in Capital [Member] |
Accumulated Deficit [Member] |
Accumulated Other Comprehensive Income [Member] |
Total |
|---|---|---|---|---|---|
| Beginning balance at Dec. 31, 2018 | $ 479,000 | $ 543,754,000 | $ (410,188,000) | $ 134,045,000 | |
| Beginning balance, shares at Dec. 31, 2018 | 47,944,486 | ||||
| Stock option-based compensation expense | 2,103,000 | 2,103,000 | |||
| Restricted stock-based compensation expense | 172,000 | 172,000 | |||
| Common stock issued for cash exercise of options | 28,000 | 28,000 | |||
| Common stock issued for cash exercise of options, shares | 5,208 | ||||
| Net loss | (18,555,000) | (18,555,000) | |||
| Other comprehensive income | |||||
| Ending balance at Mar. 31, 2019 | $ 479,000 | 546,057,000 | (428,743,000) | 117,793,000 | |
| Ending balance, shares at Mar. 31, 2019 | 47,949,694 | ||||
| Beginning balance at Dec. 31, 2019 | $ 836,000 | 664,064,000 | (486,470,000) | 178,430,000 | |
| Beginning balance, shares at Dec. 31, 2019 | 83,622,135 | ||||
| Stock option-based compensation expense | 1,256,000 | 1,256,000 | |||
| Restricted stock-based compensation expense | 464,000 | 464,000 | |||
| Net loss | (48,159,000) | (48,159,000) | |||
| Other comprehensive income | 386,000 | 386,000 | |||
| Ending balance at Mar. 31, 2020 | $ 836,000 | $ 665,784,000 | $ (534,629,000) | $ 386,000 | $ 132,377,000 |
| Ending balance, shares at Mar. 31, 2020 | 83,622,135 |
| X | ||||||||||
- Definition Amount of increase to additional paid-in capital (APIC) for recognition of cost for restricted stock unit under share-based payment arrangement. No definition available.
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- Definition Amount of increase to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, after tax and adjustment, of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Number of shares issued which are neither cancelled nor held in the treasury. No definition available.
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- Definition Number of share options (or share units) exercised during the current period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Value of stock issued as a result of the exercise of stock options. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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