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Loan Payable - Schedule of Aggregate Principal Amount of Debt Outstanding (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
Current portion of debt $ 7,500 $ 5,625
Less: unamortized debt discount (46) (49)
Current portion of debt, net of debt discount 7,454 5,576
Long-term debt, net of current portion 5,625 9,375
Less: unamortized debt discount (35) (82)
Long-term debt, net of current portion $ 5,590 $ 9,293