Commitments and Contingencies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Lease information
2020	$ 1,736
2021	1,763
2022	133
Total undiscounted lease payments	3,632
Less: Present value adjustment	(210)
Total operating lease liabilities	3,422
Less: Current portion of operating lease liabilities	(1,582)
Total operating lease liabilities, net of current portion	$ 1,840
Other lease information
Operating lease weighted-average remaining lease term (years)	2 years 22 days
Operating lease weighted-average discount rate	6.00%
Operating lease costs	$ 1,600	$ 1,600