Income Taxes - Reconciliation of the Beginning and Ending Amounts of Unrecognized Tax Benefits Roll Forward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance as of beginning of period	$ 141	$ 141
Decrease due to prior positions	0	0
Increase due to current year tax positions	0	0
Balance as of end of period	$ 141	$ 141