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Quarterly Financial Data - Summary of Quarterly Financial Data (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
Continuing operations:                        
Total revenue $ 29,000 $ 37,000 $ 30,000 $ 21,000 $ 883,000 $ 82,000 $ 23,000 $ 24,000 $ 116,887   $ 1,012,391 $ 172,297
Operating expenses 8,528,000 10,025,000 9,303,000 8,981,000 10,612,000 6,462,000 7,983,000 6,866,000 36,837,313   31,922,705 28,264,996
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)
Impairment of goodwill and other intangible assets (239,000)       (2,440,000)       (239,241) (530,100)    
Interest and other expense, net (67,000) (82,000) (178,000) (42,000) (266,000) (316,000) (357,000) (394,000)        
Net loss from continuing operations $ (8,960,000) $ (9,643,000) $ (8,462,000) $ (9,351,000) (10,108,000) (2,620,000) (11,971,000) (7,562,000) $ (36,415,026) $ (32,260,663) (32,260,663) (25,986,692)
Discontinued operations:                        
Net loss from discontinued operations         (30,000) $ (137,000) $ (144,000) $ (58,000)     (369,357) $ (452,467)
Net loss from disposal of assets         $ (111,000)           $ (111,254)  
Basic and diluted net loss per share:                        
Continuing operations         $ (0.15) $ (0.04) $ (0.21) $ (0.14) $ (0.38) $ (0.52) $ (0.52) $ (0.60)
Discontinued operations         0.00 0.00 0.00 0.00   (0.01) (0.01) (0.01)
Basic and diluted net loss per share $ (0.08) $ (0.09) $ (0.09) $ (0.14) $ (0.15) $ (0.04) $ (0.21) $ (0.14) $ (0.38) $ (0.53) $ (0.53) $ (0.61)