Income Taxes - Components of Income Tax (Benefit) Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Expected Statutory benefit	$ (25,218)	$ (5,257)
Other non-deductible expenses	230	133
PPP loan forgiveness	(703)	0
Change in valuation allowance	8,395	4,674
Debt conversions and issuances	4,394	0
Research credits	(330)	(504)
Tax rate differential - foreign vs. U.S.	5,403	1,073
State income taxes, net of federal benefit	265	18
Write-off of deferred tax assets	7,915	0
Uncertain tax positions	1,644	0
Prior year true-up	(58)	(45)
Exchange gain	1	(1)
Total income tax expense	$ 1,938	$ 91