Leases - Supplemental Cash flow Information to operating leases (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Supplemental cash flow information
Cash paid for amounts included in the measurement of operating lease liabilities	$ 6,196	$ 6,506
Operating ROU assets obtained in exchange for lease liabilities	7,047	$ 2,254
Supplemental balance sheet information
Operating lease ROU assets	36,137		$ 34,382
Operating lease liabilities:
Accrued expenses and other current liabilities	7,221		6,708
Operating lease liabilities	29,716		28,579
Total operating lease liabilities	$ 36,937		$ 35,287