Income Taxes - Summary of Deferred tax assets and liabilities (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Gross deferred tax liabilities
Net deferred tax liability	$ 1,613	$ 1,840		$ 1,613
Principal components of the deferred tax assets and liabilities
Income Tax Benefit	$ (227)	$ 900	$ (200)	$ (227)	$ (228)