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Borrowings (Tables)
9 Months Ended
Sep. 30, 2018
Debt Disclosure [Abstract]  
Schedule of Annual Future Minimum Principal Payments Under Loan Agreements
Approximate annual future minimum principal payments under the loan agreements as of September 30, 2018 are as follows (in thousands):
Year Ending at, December 31,
 
2018 (with three months remaining)
$

2019

2020
4,444

2021
17,778

2022
17,778

Total future minimum payments
40,000

Less:
 
Amount representing debt discount
(1,101
)
Total minimum payments
$
38,899