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Loan Payable to Silicon Valley Bank (Tables)
 12 Months Ended
Dec. 31, 2017
Loan Payable to Silicon Valley Bank [Abstract]  
Principal and interest payments due on loan payable
As of December 31, 2017, principal and interest payments due on the loan payable in each of the next three years are as follows (in thousands):
 
 
Year Ending
December 31,
 
Loan
Payments
 
2018
 
$
876
 
2019
  
835
 
2020
  
386
 
 
Total payments of principal and interest
 
 
2,097
 
 
Less: amounts representing interest
  
(114
)
 
Total payments of principal before deferred financing costs
 
 
1,983
 
 
Less: deferred financing costs
  
(113
)
 
Total loan payable, net of deferred financing costs
 
$
1,870