Leases - Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Operating lease cost	$ 2,657	$ 1,943	$ 7,501	$ 4,961
Short-term lease cost	253	339	1,260	1,053
Variable lease cost	1,084	511	2,710	1,294
Total lease cost	$ 3,994	$ 2,793	$ 11,471	$ 7,308