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Oxford Term Loans (Tables)
3 Months Ended
Mar. 31, 2019
Debt Disclosure [Abstract]  
Schedule of Maturities of Long-term Debt
As of March 31, 2019, the principal amounts of long-term debt maturities during each of the next five fiscal years, and the Final Payment in 2024 which is accreted through interest expense over the life of the Term Loans are as follows (in thousands):
 
Principal
 
Final Payment
 
Total
2022
$
26,087

 
$

 
$
26,087

2023
39,130

 

 
39,130

2024
9,783

 
4,125

 
13,908

 
$
75,000

 
$
4,125

 
$
79,125