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Borrowings (Tables)
 6 Months Ended
Jun. 30, 2020
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:
June 30, 2020December 31, 2019
 (in thousands)
Principal and final fee payments$41,000  $40,000  
Less: Unamortized debt issuance costs(736) (777) 
          Unaccreted value of final fee(1,000) —  
Outstanding debt, net of debt issuance costs and unaccreted value of final fee$39,264  $39,223  
Classified as:
Current portion of long-term borrowings$—  $4,358  
Long-term borrowings$39,264  $34,865  
Schedule of Annual Future Minimum Principal Payments Under Loan Agreements
The table below summarizes the future principal and final fee payments under the Solar Term Loan as of June 30, 2020:
Year ending December 31,(in thousands)
2020 (remaining six months)$—  
2021—  
2022—  
202311,667  
202420,000  
Thereafter9,333  
Total principal and final fee payments
$41,000