Quarterly report pursuant to Section 13 or 15(d)

Private Placement - Additional Information (Detail)

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Private Placement - Additional Information (Detail)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
$ / shares
shares
Jun. 30, 2016
$ / shares
shares
Jun. 30, 2016
$ / shares
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 43,058,827 43,058,827 39,833,023
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 $ 2.015 $ 2.015  
Convertible preferred stock, shares issued upon conversion 1,000 1,000 1,000  
Preferred Stock, shares issued 4,963 4,963 4,963 0
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 0.4 0.4  
Exercise price | $ / shares $ 2.00 $ 2.00 $ 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 0.2 0.2  
Exercise price | $ / shares $ 3.00 $ 3.00 $ 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 $ 2.015 $ 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 3,225,804 3,225,804  
2016 PIPE [Member] | Common Stock [Member]        
Schedule of Capitalization, Equity [Line Items]        
Increase in number of shares   3,225,804 3,225,804  
2016 PIPE [Member] | Series A Convertible Preferred Stock [Member]        
Schedule of Capitalization, Equity [Line Items]        
Preferred Stock, shares issued 4,963 4,963 4,963  
Increase in number of shares   4,963 4,963