Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
INCOME TAX [Abstract]
Income tax expense	$ (15)	$ 0	$ (22)	$ 0
Percentage of pre-tax income			0.04%