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Oxford Term Loans (Tables)
12 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
Schedule of Maturities of Long-term Debt
As of December 31, 2019, the principal amounts of long-term debt maturities during each of the next five fiscal years are as follows:
Fiscal year
 
2022
$
26,087

2023
39,130

2024
9,783

Total principal payments
75,000

Unamortized debt discounts and issuance costs
(1,492
)
Long term debt, net of discounts and issuance costs
$
73,508