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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Income Tax Disclosure [Abstract] |  |  |
Net operating loss carryforwards | $ 50,802,000 | $ 38,761,000 |
General business credit carryforwards | 3,939,000 | 3,214,000 |
State credits | 2,934,000 | 3,012,000 |
Property, equipment and goodwill | (28,000) | (72,000) |
Stock options | 7,960,000 | 6,316,000 |
Derivatives |  | (57,000) |
Deferred revenue | 62,000 | 62,000 |
Intangible assets | 1,625,000 | 399,000 |
Other | 28,000 | 80,000 |
Gross deferred tax assets | 67,322,000 | 51,715,000 |
Valuation allowance | (67,322,000) | (51,715,000) |
Net deferred taxes |  |  | $ 34,400,000

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