Fair Value Measurements - Exclusive of National Financial Instruments Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands |
Jun. 30, 2019 |
Dec. 31, 2018 |
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| Assets | ||
| Fair value of investment | $ 11,193 | |
| Total | 11,193 | |
| Liabilities | ||
| Liabilities | $ 10,905 | |
| Warrants to Purchase Common Stock [Member] | ||
| Liabilities | ||
| Liabilities | 991 | |
| Caelum Convertible Notes [Member] | ||
| Liabilities | ||
| Liabilities | 9,914 | |
| Fair Value, Inputs, Level 3 [Member] | ||
| Assets | ||
| Fair value of investment | 11,193 | |
| Total | $ 11,193 | |
| Liabilities | ||
| Liabilities | 10,905 | |
| Fair Value, Inputs, Level 3 [Member] | Warrants to Purchase Common Stock [Member] | ||
| Liabilities | ||
| Liabilities | 991 | |
| Fair Value, Inputs, Level 3 [Member] | Caelum Convertible Notes [Member] | ||
| Liabilities | ||
| Liabilities | $ 9,914 |
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- References No definition available.
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Fair value of financial and nonfinancial obligations. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- References No definition available.
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