Leases (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Leases
Total lease cost	$ 174	$ 237	$ 580	$ 663
Classification of operating leases
Operating lease right-of-use assets	1,955		1,955		$ 1,833
Operating lease liability, current	$ 595		$ 595		538
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other Accrued Liabilities, Current		Other Accrued Liabilities, Current
Operating Lease, Liability, Noncurrent	$ 1,527		$ 1,527		$ 1,574
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other Liabilities, Noncurrent		Other Liabilities, Noncurrent
Lease cost
Operating lease cost	$ 168	172	$ 488	488
Short-term lease cost	6	65	92	175
Total lease cost	$ 174	$ 237	$ 580	663
Lease Term and Discount Rate
Weighted average remaining lease term	3 years 10 months 24 days		3 years 10 months 24 days
Weighted average discount rate	6.30%		6.30%
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases			$ 444	428
Operating lease right-of-use assets obtained in exchange for new operating lease liabilities			$ 541	$ 393
Minimum
Leases
Initial lease term	1 year		1 year
Maximum
Leases
Initial lease term	7 years		7 years