Leases (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Leases
Weighted average remaining lease term	53 months
Right-of-use assets	$ 1,900		$ 2,000
Operating lease liabilities	$ 2,923		$ 3,000
Operating Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:OtherAccruedLiabilitiesNoncurrent us-gaap:AccruedLiabilitiesCurrent		us-gaap:OtherAccruedLiabilitiesNoncurrent us-gaap:AccruedLiabilitiesCurrent
Total lease costs	$ 200	$ 200
Weighted-average incremental borrowing rate used to determine right-of-use assets and lease liabilities	11.00%
Maturities of operating lease liabilities
Remaining nine months of 2021	$ 616
2022	807
2023	823
2024	840
Thereafter	642
Total lease payments	3,728
Less: imputed interest	(805)
Total lease liabilities	2,923		$ 3,000
Current operating lease liabilities	519
Non-current operating lease liabilities	$ 2,404
Minimum
Leases
Operating lease agreement term	36 months
Operating lease renewal term	24 months
Maximum
Leases
Operating lease agreement term	78 months
Operating lease renewal term	60 months
Short-term operating lease costs	$ 100	$ 100