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Loan Payable Tables (Tables)
 6 Months Ended
Jun. 30, 2017
Debt Instrument [Line Items]  
Schedule of Long-term Debt Instruments [Table Text Block]
As of June 30, 2017 and December 31, 2016, long-term debt consisted of the following (in thousands):
 
 
June 30, 2017
 
December 31, 2016
Term Loans
 
 
 
 
     Term Loan A - 6.9% principal
 
$
10,000

 
$
10,000

     Term Loan B - 6.9% principal
 
10,000

 
10,000

     Term Loan C - 7.4% principal
 
15,000

 
—

     Final fee obligation
 
1,537

 
400

     Repayment of principal
 
(952
)
 
—

     Unamortized issuance costs
 
(1,409
)
 
(585
)
Total debt, net
 
34,176

 
19,815

Current portion of long-term debt
 
(19,275
)
 
(7,935
)
Long-term debt
 
$
14,901

 
$
11,880