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Debt - MidCap Facility Agreement (Details) - USD ($)
1 Months Ended 3 Months Ended
Jul. 10, 2015
Aug. 30, 2013
Jul. 31, 2015
Mar. 31, 2016
Mar. 11, 2016
Jul. 09, 2015
Aug. 29, 2013
Line of Credit Facility [Line Items]              
Unamortized debt issuance and debt discount costs       $ 6,152,000      
Prior Credit Facility with MidCap [Member]              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity             $ 50,000,000
Amended Credit Facility with MidCap [Member]              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity   $ 73,000,000          
Term loan payments       500,000      
Amended Credit Facility with MidCap [Member] | Term Loan [Member]              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity       38,000,000      
Proceeds from lines of credit   $ 28,000,000 $ 5,000,000        
Line of credit       $ 26,500,000      
Basis spread       8.00%      
Interest rate description       ("LIBOR") plus 8.0%      
Floor on interest rate       9.50%      
Interest rate       9.50%      
Amended Credit Facility with MidCap [Member] | Credit Facility [Member]              
Line of Credit Facility [Line Items]              
Maximum borrowing base       $ 40,000,000      
Line of credit       $ 29,800,000      
Basis spread       6.00%      
Interest rate description       LIBOR plus 6.0%      
Interest rate       6.40%      
Amended Credit Facility with MidCap [Member] | Maximum [Member]              
Line of Credit Facility [Line Items]              
Additional interest rate to be charged in the event of default       5.00%      
Second Amendment Credit Facility with MidCap [Member]              
Line of Credit Facility [Line Items]              
Debt issuance costs       $ 700,000   $ 400,000  
Second Amendment Credit Facility with MidCap [Member] | Term Loan [Member]              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity $ 38,000,000         $ 33,000,000  
Proceeds from lines of credit $ 5,000,000            
Monthly payments for term loan       $ 500,000      
Commitment fee percentage       1.00%      
Third Amendment Credit Facility with MidCap [Member] | Credit Facility [Member]              
Line of Credit Facility [Line Items]              
Amendment fee amount         $ 500,000