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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)

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