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Borrowings (Tables)
 3 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]  
Schedule of Outstanding Borrowings
The following table summarizes the outstanding borrowings from the term loan described below, as of the dates presented:
March 31, 2021December 31, 2020
 (in thousands)
Principal outstanding and final fee$41,000 $41,000 
Less: Unamortized debt issuance costs(624)(661)
          Unaccreted value of final fee(833)(884)
Outstanding debt, net of debt issuance costs and unaccreted value of final fee$39,543 $39,455 
Classified as:
Long-term borrowings$39,543 $39,455 
Schedule of Future Principal and Final Fee Payments The table below summarizes the future principal and final fee payments under the Solar Term Loan as of March 31, 2021:
Year ending December 31,(in thousands)
2021 (remaining nine months)$— 
2022— 
202311,667 
202420,000 
20259,333 
Total principal and final fee payments$41,000