Leases - Lease Balance Sheet (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Leases
Operating lease right-of-use assets	$ 1,620
Operating lease liabilities, current	$ 506
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccruedExpensesAndOtherCurrentLiabilities
Operating lease liabilities, net of current portion	$ 1,321
Total operating lease liabilities	$ 1,827