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Warrants - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 12, 2016 | May 31, 2016 | Dec. 31, 2016
Class of Warrant or Right [Line Items] |  |  |
Fair value of warrants liability |  | $ 44.7 |
Exercise price of warrants |  | $ 7.50 | $ 13.05
Class of warrants exercised |  |  | 0
A Warrants |  |  |
Class of Warrant or Right [Line Items] |  |  |
Fair value of warrants liability | $ 12.8 |  | $ 7.4
Class of warrants expiration period upon issuance |  | 2 years |
Valuation technique |  |  | Monte Carlo valuation pricing model
Warrant liability fair value assumptions, risk-free rate | 0.76% |  | 1.10%
Warrant liability fair value assumptions, dividend yield | 0.00% |  | 0.00%
Warrant liability fair value assumptions, remaining term | 2 years |  | 1 year 4 months 24 days
Warrant liability fair value assumptions, volatility rate | 95.00% |  | 118.00%
Warrant liability fair value assumptions, assumed probability | 10.00% |  | 10.00%
Warrant fair value adjustments |  |  | $ 5.4
B Warrants |  |  |
Class of Warrant or Right [Line Items] |  |  |
Fair value of warrants liability | $ 5.0 |  |
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 |  | 7,281,553 |
Maximum | B Warrants |  |  |
Class of Warrant or Right [Line Items] |  |  |
Warrants to purchase of common stock |  | 2,427,184 |
Registered Offering |  |  |
Class of Warrant or Right [Line Items] |  |  |
Number of shares sold in underwritten public offering |  | 9,708,737 |

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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 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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