Income Taxes - Schedule of Deferred Tax Assets And Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
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)