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Income Taxes - Schedule of Deferred Tax Assets And Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Components Of Deferred Tax Assets And Liabilities [Abstract] |  |  |
Net operating losses | $ 33,392 | $ 24,852 | $ 16,372
Stock-based compensation | 2,531 | 3,637 | 2,747
Financing lease obligations | 4,574 | 4,640 | 4,009
Tax credit carry forwards | 2,577 | 2,106 | 922
Compensation | 339 | 97 | 474
Derivative liability | 703 |  |
Other | 391 | 307 | 116
Gross deferred tax assets | 44,507 | 35,639 | 24,640
Less valuation allowance | (39,898) | (30,888) | (20,329)
Net deferred tax assets | 4,609 | 4,751 | 4,311
Fixed assets | (4,609) | (4,746) | (4,352)
Other |  | (5) | 41
Gross deferred tax liabilities | $ (4,609) | $ (4,751) | $ (4,311)

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