Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Leases
Increase in right-of-use assets			$ 4,600
Increase in operating lease liabilities			4,600
Operating lease costs	$ 600		800	$ 100
Cash paid for the amounts included in the measurement of lease liabilities	$ 600		$ 800	100
Weighted-average remaining lease term of operating leases	2 years 8 months 12 days		2 years 8 months 12 days
Weighted average discount rate	3.60%		3.60%
Right of use assets obtained in exchange for lease obligations			$ 0	$ 0
Future maturities of operating lease liabilities
2020 (remaining)	$ 1,209		1,209
2021	2,380		2,380
2022	2,333		2,333
2023	584		584
Total lease payments	6,506		6,506
Less imputed interest	307		307
Total	$ 6,199		$ 6,199
Maximum
Leases
Operating lease costs		$ 100
Cash paid for the amounts included in the measurement of lease liabilities		$ 100
Principal executive offices
Leases
Operating lease term	5 years		5 years
Automobile leases and IT equipment leases
Leases
Operating lease term	3 years		3 years