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Stockholders' Equity - Schedule of Allocation of Stock-based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Stock-based compensation expense | $ 554 | $ 930 | $ 1,510 | $ 1,998
Cost of product sales |  |  |  |
Stock-based compensation expense | 22 | 17 | 44 | 92
Research and development cost |  |  |  |
Stock-based compensation expense | 15 | 19 | 120 | 134
General and administrative expense |  |  |  |
Stock-based compensation expense | $ 517 | $ 894 | $ 1,346 | $ 1,772

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