Commitments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Nov. 30, 2019
Maturity analysis of undiscounted cash flows of operating lease liabilities
2020	$ 1,449
2021	740
2022	438
Total minimum lease payments	2,627
Rent expense (Topic 842)	400
Rent expense (Topic 840)		$ 1,100
Lease payments (Topic 842)	1,400	1,400
Sublease
Future sublease income to be received in the next twelve months	500
Sublease income received	1,000	$ 300
Operating Lease, Right-of-Use Asset	$ 2,349		$ 1,700
Operating Lease, Liability			$ 1,700
Operating Lease, Weighted Average Discount Rate, Percent			7.49%