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Long-term Notes Payable (including current portion) and Line of Credit - Additional Information (Details)
 1 Months Ended 6 Months Ended 9 Months Ended
Feb. 01, 2017
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2013
USD ($)
Installment
Sep. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Loan Agreement With Silicon Valley Bank            
Line Of Credit Facility [Line Items]            
Liquidity ratio       125.00%    
Loan agreement amount   $ 4,000,000        
Term of payments   36 months        
Date of maturity   Dec. 01, 2018        
Minimum EBITDA         $ 750,000  
Interest rate fixed percentage   5.00%        
Long-term debt       $ 1,666,666 1,666,666 $ 2,666,666
Loan Agreement With Silicon Valley Bank | Maximum            
Line Of Credit Facility [Line Items]            
Unrestricted Cash Required For Line Of Credit Covenant       25,000,000 25,000,000  
Silicon Valley Bank | Revolving Credit Facility            
Line Of Credit Facility [Line Items]            
Line of credit facility allowable amount       3,000,000 $ 3,000,000  
Facility interest rate         4.25%  
Liquidity ratio         125.00%  
Line of credit facility maturity date         2018-04  
Line of credit       0 $ 0 0
Silicon Valley Bank | Revolving Credit Facility | U.S. Prime Rate            
Line Of Credit Facility [Line Items]            
Basis spread on variable interest rate         1.25%  
Silicon Valley Bank | Revolving Credit Facility | Growth Capital Term Loan            
Line Of Credit Facility [Line Items]            
Line of credit facility allowable amount     $ 750,000      
Line of credit       $ 0 $ 0 $ 55,230
Line of credit facility, payment terms         The growth capital term loan required interest only payments through June 30, 2014 at which point it was to be repaid in 32 equal monthly installments of interest and principal.  
Number of monthly installments for principal and interest payment | Installment     32      
Line of credit facility maturity date         Feb. 01, 2017  
Payment of principal and accrued interest $ 55,230          
Line of credit facility interest rate     6.50%