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Long-Term Debt - Debt, Net of Unamortized Debt Issuance Costs (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
Debt, principal $ 20,000 $ 20,000
Accrued loan fees 1,500 1,500
Debt, total 21,500 21,500
Less: unamortized debt issuance costs (929) (1,164)
Debt, net of unamortized debt issuance costs 20,571 20,336
Less: debt, current portion (5,000) 0
Debt, net of unamortized debt issuance costs, net of current portion $ 15,571 $ 20,336