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Income Taxes - Provision for Income Taxes Reconciliation to Statutory Federal Income Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Federal tax benefit, at statutory rate	$ (23,192)	$ (8,311)
State benefit, net of federal benefit	(1,285)	27
Foreign tax rate difference	(140)	476
Valuation allowance against future tax benefits	26,410	9,168
Loss on conversion of debt	2,015	0
Research and development credits	(2,355)	(1,456)
Share-based compensation	(1,134)	341
Other, including true-up of prior year provisions	429	291
Provision for income taxes	$ 748	$ 536

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Effective Income Tax Rate Reconciliation, Conversion Of Debt, Amount

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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