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Warrants - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
May 31, 2016 | May 12, 2016 | Jun. 30, 2016 | Nov. 30, 2015
Class of Warrant or Right [Line Items] |  |  |  |
Number of shares sold in underwritten public offering | 48,543,692 |  |  |
Warrants to purchase of common stock |  |  |  | 159,304
Fair value of warrants liability | $ 44,700 |  |  |
Exercise price of warrants | $ 1.50 |  |  |
Class of warrants exercised |  |  | 0 |
Warrant fair value adjustment |  |  | $ 5,306 |
A Warrants |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Warrants to purchase of common stock | 36,407,765 |  |  |
Fair value of warrants liability |  | $ 12,800 | $ 18,100 |
Class of warrants expiration period upon issuance | 2 years |  |  |
Warrant fair value adjustment |  | $ 5,306 |  |
Warrant liability issuance date |  | May 12, 2016 |  |
B Warrants |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Warrants to purchase of common stock | 12,135,921 |  |  |
Fair value of warrants liability |  | $ 5,000 |  |
Class of warrants expiration period upon issuance | 30 months |  |  |
Warrants exercisable date | 2017-05 |  |  |
Maximum | A Warrants |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Warrants to purchase of common stock | 36,407,765 |  |  |
Maximum | B Warrants |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Warrants to purchase of common stock | 12,135,921 |  |  |
Registered Offering |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Number of shares sold in underwritten public offering | 48,543,687 |  |  |

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- Definition Class Of Warrant Or Rights Month Year From Which Warrants Or Rights Exercisable + References No definition available. + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares. + References No definition available. + Details
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- Definition Amount of expense (income) related to adjustment to fair value of warrant liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 25 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6939902&loc=d3e20148-110875 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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