Quarterly report pursuant to Section 13 or 15(d)

Lease Obligations - Summary of Components of Leasing Costs and Rent (Details)

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Lease Obligations - Summary of Components of Leasing Costs and Rent (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Leases [Abstract]        
Operating lease costs $ 261 $ 196 $ 783 $ 456
Short-term lease costs 7 74 21 215
Variable lease costs 44 1 124 3
Total rent expense $ 312 $ 271 $ 928 $ 674
Weighted average remaining lease term - operating leases (in years) 9 years 8 months 4 days   9 years 8 months 4 days  
Weighted average discount rate - operating leases 5.20%   5.20%