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Subsequent Events - Additional Information (Detail) - Loan and Security Agreement [Member]
9 Months Ended
Oct. 28, 2016
USD ($)
Tranche
Installment
$ / shares
shares
Sep. 30, 2016
Horizon Technology Finance Corporation and Silicon Valley Bank [Member]    
Subsequent Event [Line Items]    
Variable rate basis   one-month LIBOR
Interest rate description   Each loan tranche bears interest at a floating rate equal to 10.5% plus the amount by which the one-month London Interbank Offer Rate (“LIBOR”) exceeds 0.5%.
Warrant exercise price condition   exercise price equal to the lower of (a) the volume weighted average price per share of the Company’s Class A Common Stock, as reported on the principal stock exchange on which the Company’s Class A Common Stock is listed, for 10 trading days prior to the issuance of the applicable Warrants or (b) the closing price of a share of the Company’s Class A Common Stock on the trading day prior to the issuance of the applicable Warrants.
Horizon Technology Finance Corporation and Silicon Valley Bank [Member] | Tranche One [Member]    
Subsequent Event [Line Items]    
Debt instrument, payment terms   The Company has agreed to repay the first tranche of $12.5 million on an interest only basis monthly until May 1, 2018 followed by equal monthly payments of principal plus accrued interest through the scheduled maturity date for the first tranche loan on May 1, 2020.
Horizon Technology Finance Corporation and Silicon Valley Bank [Member] | Tranche Two and Three [Member]    
Subsequent Event [Line Items]    
Debt instrument, payment terms   The Company has agreed to repay any amounts advanced under the second and third tranches of $7.5 million and $5.0 million, respectively, in 18 monthly payments of interest only followed by 24 equal monthly payments of principal plus accrued interest through the scheduled maturity date for such loans which is 42 months following the date the Company draws down the second or third tranche loans, as applicable.
Subsequent Event [Member] | LIBOR [Member]    
Subsequent Event [Line Items]    
Debt instrument, interest rate floor 0.50%  
Subsequent Event [Member] | Horizon Technology Finance Corporation and Silicon Valley Bank [Member]    
Subsequent Event [Line Items]    
Loan borrowing capacity $ 25,000,000  
Number of tranches | Tranche 3  
Debt instrument, interest rate floor 10.50%  
Additional default interest rate 5.00%  
Warrants to purchase shares of common stock | shares 152,580  
Exercise price of warrants | $ / shares $ 6.39  
Warrants expiration period 7 years  
Subsequent Event [Member] | Horizon Technology Finance Corporation and Silicon Valley Bank [Member] | Prepayments for First 18 Months [Member]    
Subsequent Event [Line Items]    
Prepayment penalty fee 4.00%  
Subsequent Event [Member] | Horizon Technology Finance Corporation and Silicon Valley Bank [Member] | Prepayments Thereafter [Member]    
Subsequent Event [Line Items]    
Prepayment penalty fee 2.00%  
Subsequent Event [Member] | Horizon Technology Finance Corporation and Silicon Valley Bank [Member] | Tranche One [Member]    
Subsequent Event [Line Items]    
Loan borrowing capacity $ 12,500,000  
Tranches expiration date Oct. 28, 2016  
Debt instrument, final payment $ 800,000  
Debt instrument, maturity date May 01, 2020  
Warrant shares percentage issued of loan amount 6.00%  
Subsequent Event [Member] | Horizon Technology Finance Corporation and Silicon Valley Bank [Member] | Tranche Two [Member]    
Subsequent Event [Line Items]    
Loan borrowing capacity $ 7,500,000  
Tranches expiration date Mar. 31, 2017  
Debt instrument, final payment $ 500,000  
Warrant shares percentage issued of loan amount 3.00%  
Additional warrant shares percentage issued of loan amount 3.00%  
Subsequent Event [Member] | Horizon Technology Finance Corporation and Silicon Valley Bank [Member] | Tranche Three [Member]    
Subsequent Event [Line Items]    
Loan borrowing capacity $ 5,000,000  
Tranches expiration date Jun. 30, 2017  
Debt instrument, final payment $ 300,000  
Additional warrant shares percentage issued of loan amount 6.00%  
Subsequent Event [Member] | Horizon Technology Finance Corporation and Silicon Valley Bank [Member] | Tranche Two and Three [Member]    
Subsequent Event [Line Items]    
Number of installments for loan repayment | Installment 42  
Number of installments for interest payment | Installment 18  
Number of installments for principal and interest payment | Installment 24