Income Taxes - Summary of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Current:
Federal	$ 0	$ 0
Foreign	53	0
State	50	0
Current income tax expense (benefit)	103	0
Deferred:
Federal	0	0
Foreign	0	0
State	0	0
Deferred income tax expense (benefit)	0	0
Income tax expense	$ 103	$ 0