Quarterly report pursuant to Section 13 or 15(d)

Redeemable Convertible Preferred Stock - Additional Information (Detail)

v3.7.0.1
Redeemable Convertible Preferred Stock - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Class of Stock [Line Items]    
Convertible preferred stock, public offering gross proceeds for automatic conversion $ 15,000,000  
Convertible preferred stock conversion terms In the event of a conversion to common stock, the holders of the redeemable convertible preferred stock will receive one share of the Company's common stock for each share of redeemable convertible preferred stock converted, multiplied by (i) the share's original issuance price plus the liquidation preference of such share divided by (ii) the share's original issue price, with cash paid for any fractional shares.  
Series B Redeemable Convertible Preferred Stock [Member]    
Class of Stock [Line Items]    
Liquidation preference $ 5.98 $ 5.86
Debt beneficial conversion feature $ 226,000  
Debt amortization of discount $ 57,000  
Preferred stock conversion ratio 0.74 0.73
Series A Redeemable Convertible Preferred Stock [Member]    
Class of Stock [Line Items]    
Liquidation preference $ 2.17 $ 2.14
Debt beneficial conversion feature $ 328,000  
Debt amortization of discount $ 82,000  
Preferred stock conversion ratio 0.74 0.73