Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Leases
Weighted average remaining lease term	51 months		51 months
Right-of-use assets	$ 1,800		$ 1,800		$ 2,000
Operating lease liabilities	$ 2,795		$ 2,795		$ 3,000
Operating Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:OtherAccruedLiabilitiesNoncurrent us-gaap:AccruedLiabilitiesCurrent		us-gaap:OtherAccruedLiabilitiesNoncurrent us-gaap:AccruedLiabilitiesCurrent		us-gaap:OtherAccruedLiabilitiesNoncurrent us-gaap:AccruedLiabilitiesCurrent
Total lease costs	$ 100	$ 300	$ 200	$ 300
Weighted-average incremental borrowing rate used to determine right-of-use assets and lease liabilities	11.00%		11.00%
Maturities of operating lease liabilities
Remaining six months of 2021	$ 408		$ 408
2022	807		807
2023	823		823
2024	840		840
Thereafter	642		642
Total lease payments	3,520		3,520
Less: imputed interest	(725)		(725)
Total lease liabilities	2,795		2,795		$ 3,000
Current operating lease liabilities	529		529
Non-current operating lease liabilities	$ 2,266		$ 2,266
Minimum
Leases
Operating lease agreement term	36 months		36 months
Operating lease renewal term	24 months		24 months
Maximum
Leases
Operating lease agreement term	78 months		78 months
Operating lease renewal term	60 months		60 months
Short-term operating lease costs	$ 100	$ 100	$ 100	$ 100