Leases - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Mar. 31, 2021	Dec. 31, 2020
Lessee Lease Description [Line Items]
Right-of-use assets from operating leases	$ 12,932		$ 12,932			$ 18,483
Operating lease liability	16,812		16,812			$ 20,453
Impairment charges on right of use assets			4,200
Variable lease cost	$ 0	$ 0	0	$ 0
Plano, Texas
Lessee Lease Description [Line Items]
Restructuring charges			1,700
Hanover, Germany
Lessee Lease Description [Line Items]
Restructuring charges			$ 2,500
Lease Agreement | Plano, Texas
Lessee Lease Description [Line Items]
Right-of-use assets from operating leases					$ 1,700
Operating lease liability					$ 1,700