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Long-Term Debt - Summary of Long-term Notes Payable (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Feb. 28, 2018
Debt Instrument [Line Items]      
Other $ 6 $ 12  
Facility fee amount 238 170  
Unamortized debt discount and debt issuance costs (349) (458)  
Notes payable, total 24,438 23,812  
Less: current maturities (7,202)    
Long‑term notes payable 17,236 23,812  
2018 Notes      
Debt Instrument [Line Items]      
2018 Notes $ 24,543 $ 24,088 $ 23,000
Facility fee amount     $ 200