Quarterly report pursuant to Section 13 or 15(d)

Private Placement - Additional Information (Detail)

v3.5.0.2
Private Placement - Additional Information (Detail)
$ / shares in Units, $ in Millions
 1 Months Ended
Jun. 30, 2016
USD ($)
$ / shares
shares
Sep. 30, 2016
shares
Dec. 31, 2015
shares
Schedule of Capitalization, Equity [Line Items]      
Number of shares in a unit 1    
Common stock, shares issued   43,058,827 39,833,023
Preferred Stock, shares issued   4,963 0
Warrant exercisable period 5 years    
Series A Convertible Preferred Stock [Member]      
Schedule of Capitalization, Equity [Line Items]      
Number of shares in a unit 1    
Shares issued price per share | $ / shares $ 2.015    
Convertible preferred stock, shares issued upon conversion 1,000    
Tranche A Warrant [Member]      
Schedule of Capitalization, Equity [Line Items]      
Number of warrants 1    
Number of shares to be purchased by a warrant 0.4    
Exercise price | $ / shares $ 2.00    
Tranche B Warrant [Member]      
Schedule of Capitalization, Equity [Line Items]      
Number of warrants 1    
Number of shares to be purchased by a warrant 0.2    
Exercise price | $ / shares $ 3.00    
Securities Purchase Agreement [Member]      
Schedule of Capitalization, Equity [Line Items]      
Number of units in the transaction 8,188,804    
Per unit price of private placement | $ / shares $ 2.015    
Gross proceeds from private placement | $ $ 16.5    
Net proceeds from private placement | $ $ 15.3    
2016 PIPE [Member]      
Schedule of Capitalization, Equity [Line Items]      
Common stock, shares issued 3,225,804    
2016 PIPE [Member] | Series A Convertible Preferred Stock [Member]      
Schedule of Capitalization, Equity [Line Items]      
Preferred Stock, shares issued 4,963