XML 96 R80.htm IDEA: XBRL DOCUMENT v3.3.1.900
Warrant Liability - Summary of Changes in Fair Value of Warrant Liability (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Nov. 30, 2014
Dec. 31, 2013
Class of Warrant or Right [Line Items]                        
Fair value of warrant liability, beginning balance       $ 1,684,551         $ 1,684,551      
Change in fair value of warrant liability $ 155,000 $ (427,000) $ (988,000) $ 347,000 $ (2,327,000) $ (4,076,000) $ 3,654,000 $ 327,000 913,587 $ 2,422,451 $ 2,422,451 $ 3,253,253
Fair value of warrant liability, ending balance $ 770,964       $ 1,684,551       $ 770,964 $ 1,684,551    
Series A Warrants [Member]                        
Class of Warrant or Right [Line Items]                        
Number of Warrants, beginning balance       6,936,880         6,936,880      
Number of Warrants, changes in fair value 0               0      
Number of Warrants, ending balance 6,936,880       6,936,880       6,936,880 6,936,880    
Fair value of warrant liability, beginning balance       $ 1,684,551         $ 1,684,551      
Change in fair value of warrant liability                 (913,587)      
Fair value of warrant liability, ending balance $ 770,964       $ 1,684,551       $ 770,964 $ 1,684,551