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Notes Payable - Lines of Credit and Debt Instruments (Details) - USD ($)
6 Months Ended
Mar. 31, 2015
Aug. 27, 2014
Jun. 30, 2017
Jun. 30, 2015
Term Loan A        
Line of Credit Facility        
Maximum borrowing capacity   $ 5,000,000    
Proceeds from issuance of promissory notes   5,000,000    
Term Loan B        
Line of Credit Facility        
Proceeds from issuance of promissory notes $ 5,000,000      
Other Term Loan        
Line of Credit Facility        
Maximum borrowing capacity   20,000,000    
Credit Facility        
Line of Credit Facility        
Initial borrowings     $ 10,000,000  
Maximum borrowing capacity   $ 25,000,000    
Number of monthly payments (in number of payments)     36  
Interest rate (as a percent)     7.49%  
Percentage of amount outstanding due as a payment (as a percent)     3.48%  
Effective interest rate (as a percent)     11.20%  
Debt Instruments        
Financial covenants     0  
Final judgment amount that would trigger lender rights for remedy     $ 250,000  
Basis spread     5.00%  
Interest rate increase in the event of a default (as a percent)     5.00%  
Minimum | Credit Facility        
Line of Credit Facility        
Percentage of amount outstanding due as a payment (as a percent)     1.00%  
Maximum | Credit Facility        
Line of Credit Facility        
Percentage of amount outstanding due as a payment (as a percent)     3.00%  
Warrant Liability        
Debt Instruments        
Exercise period     7 years  
2014 Warrants | Term Loan A        
Debt Instruments        
Number of shares after conversion of issued warrants (in shares)     157,844  
2015 Warrants | Term Loan B        
Debt Instruments        
Number of shares after conversion of issued warrants (in shares)     157,844  
2014 and 2015 Warrants        
Debt Instruments        
Value of warrants     $ 200,000  
Debt discounts     $ 200,000  
Common stock warrants | Initial public offering        
Debt Instruments        
Number of shares after conversion of issued warrants (in shares)       24,566
Exercise price of warrants (in dollars per share)       $ 12.2114