Income Taxes - Uncertain Income Tax Positions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Uncertain income tax positions [Roll Forward]
Balance at beginning of the year	$ 1,287	$ 1,084
Increases related to current year's tax positions	226	203
Balance at end of the year	$ 1,513	$ 1,287