Leases (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Leases
Total lease cost	$ 302	$ 174	$ 817	$ 580
Classification of operating leases
Operating lease right-of-use assets	1,425		1,425		$ 1,820
Operating lease liability, current	654		654		609
Operating lease liability, non-current	$ 986		$ 986		$ 1,400
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other Accrued Liabilities, Current		Other Accrued Liabilities, Current
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other Liabilities, Noncurrent		Other Liabilities, Noncurrent
Lease cost
Operating lease cost	$ 168	168	$ 505	488
Short-term lease cost	134	6	312	92
Total lease cost	$ 302	$ 174	$ 817	580
Lease Term and Discount Rate
Weighted-average remaining lease term	0 years		0 years
Weighted average discount rate	6.10%		6.10%
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases			$ 471	444
Operating lease right-of-use assets obtained in exchange for new operating lease liabilities			$ 23	$ 541
Minimum
Leases
Initial lease term	1 year		1 year
Maximum
Leases
Initial lease term	7 years		7 years