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Subsequent Events - Additional Information (Details) - Revolving Credit Facility - Silicon Valley Bank - USD ($)
 1 Months Ended 12 Months Ended
Jan. 31, 2018
Dec. 31, 2017
Subsequent Event [Line Items]    
Line of credit facility allowable amount   $ 3,000,000
Liquidity ratio   125.00%
Subsequent Event    
Subsequent Event [Line Items]    
Line of credit facility allowable amount $ 10,000,000  
Line of credit facility borrowing base limitation percentage of eligible receivables 80.00%  
Liquidity ratio 125.00%  
Interest expense borrowings $ 3,000  
Line of credit facility frequency of payments on monthly installments Borrowings outstanding under the term loan under the amended and restated loan and security agreement will continue to be repaid in equal monthly installments of interest and principal and matures on December 1, 2018.  
Line of credit facility maturity date Jan. 31, 2020  
Subsequent Event | The Wall Street Journal Prime Rate    
Subsequent Event [Line Items]    
Basis spread on variable interest rate 1.00%  
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 (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 (or, if unavailable, the Silicon Valley Bank prime rate) prime rate on a monthly basis.  
Line of credit facility floating rate not met 2.00%  
Subsequent Event | Prime Rate    
Subsequent Event [Line Items]    
Liquidity ratio 150.00%