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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, 2018
USD ($)
Dec. 31, 2018
USD ($)
Feb. 26, 2019
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Loan Agreement With Silicon Valley Bank                  
Line Of Credit Facility [Line Items]                  
Loan agreement amount     $ 4,000,000   $ 4,000,000 $ 4,000,000      
Term of payments     36 months            
Date of maturity     Dec. 01, 2018            
Liquidity ratio         125.00%        
Minimum EBITDA           750,000      
Interest rate fixed percentage     5.00%            
Long-term debt         $ 0 0 $ 1,333,333 $ 1,333,333  
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   $ 10,000,000              
Line of credit facility maturity date   Jan. 31, 2020              
Line of credit         0 $ 0      
Liquidity ratio   125.00%              
Line of credit facility borrowing base limitation percentage of eligible receivables   80.00%              
Interest rate fixed percentage   $ 3,000              
Line of credit facility floating rate not met   2.00%       5.25%      
Silicon Valley Bank | Revolving Credit Facility | The Wall Street Journal Prime Rate                  
Line Of Credit Facility [Line Items]                  
Basis spread on variable interest rate   1.00%       5.25%      
Line Of Credit Facility Interest Rate Description           The Company will be required to pay interest on borrowings outstanding, if any, under the revolving line of credit at a floating rate per annum equal to 1% above the Wall Street Journal prime rate (5.25% as of December 31, 2018) (or, if unavailable, the Silicon Valley Bank prime rate) on a monthly basis, so long as the Company maintains a liquidity ratio of cash and cash equivalents plus accounts receivable to outstanding debt under the Amended Loan Agreement minus deferred revenue of 1.50 to 1.00. If this liquidity ratio is not met, the Company will be subject to a minimum interest charge of $3,000 per month and borrowings outstanding, if any, under the revolving line of credit will accrue interest at a floating rate per annum equal to 2% above the Wall Street Journal prime rate (5.25% as of December 31, 2018) (or, if unavailable the Silicon Valley Bank prime rate) on a monthly basis. Prior to the amendment in January 2018, the revolving line of credit bore interest rate at the U.S. prime rate plus 1.25%. The revolving line of credit matures on January 31, 2020.      
Silicon Valley Bank | Revolving Credit Facility | Prime Rate                  
Line Of Credit Facility [Line Items]                  
Liquidity ratio   150.00%              
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 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%          
Line of credit         $ 0 $ 0