Leases - Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 1,289	$ 1,112
Short-term lease cost	136	224
Variable lease cost	138	100
Total lease cost	$ 1,563	$ 1,436