Leases - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Leases [Abstract]
Operating lease expense	$ 4,400
Rent expense under Topic 840		$ 4,600	$ 1,800
Weighted average remaining lease term	6 years 4 months 24 days
Weighted average discount rate	7.77%
Lease not yet commenced, liability	$ 13,700
Lease not yet commenced, imputed interest	3,400
Lease not yet commenced, sublease income	$ 100