Stockholders' Equity - Schedule of Allocation of Stock-based Compensation (Details) - USD ($) $ in Thousands |
3 Months Ended | |
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Mar. 31, 2020 |
Mar. 31, 2019 |
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| Stock-based compensation expense | $ 956 | $ 1,067 |
| Cost of product sales | ||
| Stock-based compensation expense | 22 | 75 |
| Research and development cost | ||
| Stock-based compensation expense | 105 | 115 |
| General and administrative expense | ||
| Stock-based compensation expense | $ 829 | $ 877 |
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- Definition Amount of noncash expense for share-based payment arrangement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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