Leases - Lease Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Leases
Operating lease right-of-use assets	$ 1,387	$ 1,620
Operating lease liabilities, current	$ 577	506
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued Expenses And Other Current Liabilities
Operating lease liabilities, net of current portion	$ 1,020	1,321
Total operating lease liabilities	$ 1,597	$ 1,827