Income Taxes - Uncertain Income Tax Positions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Uncertain income tax positions [Roll Forward]
Balance at beginning of the year	$ 1,084	$ 993
Increases related to current year's tax positions	203	91
Balance at end of the year	$ 1,287	$ 1,084