Leases - Balance Sheet and Statement of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Additional details of the leases
Right-of-use assets	$ 3,970
Current portion of lease liabilities	2,608
Operating lease liability, net of current portion	2,076
Total liabilities	$ 4,684
Weighted-average remaining life	1 year 9 months 18 days
Weighted-average discount rate	12.99%
Facilities
Operating lease cost	$ 2,592	$ 1,800	$ 1,700
Cash paid for operating lease	$ 2,645