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Debt - Principal Maturities of Long-Term Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
2021 (remaining six months) $ 0  
2022 1,459  
2023 5,833  
2024 5,833  
2025 4,375  
Principal balance outstanding 17,500  
less: unamortized discount and debt issuance costs (770)  
Long-term debt 16,730  
Current portion 0  
Noncurrent portion $ 16,730 $ 16,589