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Long-term Notes Payable (including current portion) and Line of Credit - Additional Information (Details)
 1 Months Ended 6 Months Ended 12 Months Ended
Feb. 01, 2017
USD ($)
Jan. 31, 2018
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2013
USD ($)
Installment
Dec. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
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         $ 1,333,333 1,333,333   $ 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  
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           4.50%    
Liquidity ratio           125.00%    
Line of credit facility maturity date           2018-04    
Line of credit         0 $ 0   $ 0
Silicon Valley Bank | Revolving Credit Facility | Subsequent Event                
Line Of Credit Facility [Line Items]                
Line of credit facility allowable amount   $ 10,000,000            
Liquidity ratio   125.00%            
Line of credit facility maturity date   Jan. 31, 2020            
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 | Capital Growth Term Loans                
Line Of Credit Facility [Line Items]                
Line of credit facility allowable amount       $ 750,000        
Line of credit         $ 0 $ 0    
Line of credit facility maturity date           Feb. 01, 2017    
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        
Payment of principal and accrued interest $ 55,230              
Line of credit facility interest rate       6.50%