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v3.3.1.900

Subsequent Events - Additional Information (Detail) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | May. 31, 2015 | Apr. 30, 2015 | Jul. 31, 2014 | Oct. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of stock units |  | $ 25,000,000 |  |  |  | $ 26,324,565 | $ 18,949,647 | $ 23,491,597
Number of stock units issued |  |  | 35,715,000 | 11,299,435 | 12,845,500 |  |  |
Number of shares called by warrants |  |  |  |  |  | 1 |  |
Warrant exercise price |  |  | $ 0.85 | $ 2.17 | $ 1.80 |  |  |
Warrant expiration period |  |  | 5 years | 13 months | 5 years |  |  |
Over-Allotment-Option [Member] |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of stock units |  | $ 1,800,000 |  |  |  |  |  |
Number of stock units issued |  | 2,757,250 | 5,357,250 |  |  |  |  |
Number of stock units issued, price per share |  | $ 0.699 | $ 0.85 |  |  |  |  |
Series A Warrants [Member] |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Number of shares called by warrants |  |  |  |  |  | 1 |  |
Subsequent Events [Member] |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Warrant expiration period | 2 years |  |  |  |  |  |  |
Term of warrant | 5 years |  |  |  |  |  |  |
Subsequent Events [Member] | Underwritten Public Offering [Member] |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of stock units | $ 8,000,000 |  |  |  |  |  |  |
Number of stock units issued | 26,667,000 |  |  |  |  |  |  |
Number of stock units issued, price per share | $ 0.30 |  |  |  |  |  |  |
Subsequent Events [Member] | Over-Allotment-Option [Member] |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Number of stock units issued | 4,000,050 |  |  |  |  |  |  |
Number of shares called by warrants | 5,000,063 |  |  |  |  |  |  |
Underwriting option exercise period | 45 days |  |  |  |  |  |  |
Subsequent Events [Member] | Series A Warrants [Member] |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Number of shares called by warrants | 0.50 |  |  |  |  |  |  |
Warrant exercise price | $ 0.30 |  |  |  |  |  |  |
Subsequent Events [Member] | Series B Warrants [Member] |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Number of shares called by warrants | 0.75 |  |  |  |  |  |  |
Warrant exercise price | $ 0.42 |  |  |  |  |  |  |

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