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Warrant Liability - Additional Information (Detail) | 1 Months Ended | 12 Months Ended
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Apr. 30, 2015 USD ($) $ / shares shares | Jul. 31, 2014 USD ($) $ / shares shares | Oct. 31, 2013 USD ($) $ / shares shares | Dec. 31, 2011 $ / shares shares | Nov. 30, 2009 USD ($) $ / shares $ / Institutions shares | Dec. 31, 2015 $ / shares shares | Dec. 31, 2014 USD ($) shares | Dec. 31, 2013 USD ($) shares | Dec. 31, 2012 USD ($) shares | Dec. 31, 2011 USD ($) $ / shares $ / Stock_Unit shares
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |
Number of securities callable by each warrant or right warrants |  |  |  |  |  | 1 |  |  |  |
Exercise price of warrants | $ / shares | $ 0.85 | $ 2.17 | $ 1.80 |  |  |  |  |  |  |
Proceeds from issuance of common stock and warrants | $ | $ 25,000,000 | $ 20,000,000 | $ 17,300,000 |  |  |  |  |  |  |
Number of shares issued upon warrants exercise | 35,715,000 | 11,299,435 | 12,845,500 |  |  |  |  |  |  |
Series A Warrants [Member] |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |
Number of securities callable by each warrant or right warrants |  |  |  |  |  | 1 |  |  |  |
Proceeds from sale of stock | $ |  |  |  |  |  |  | $ 1,652,000 | $ 538,000 | $ 3,078,000 |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |
Number of securities callable by each warrant or right warrants | 0.75 | 0.85 | 0.5 |  |  |  |  |  |  |
Number of securities callable by warrants |  |  |  |  |  |  | 1,180,015 |  |  |
Common Stock [Member] | Series A Warrants [Member] |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |
Exercise price of warrants | $ / shares | $ 0.70 |  |  |  |  |  |  |  |  |
November 2009 Financing [Member] |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |
Number of units sold to investors |  |  |  |  | 1,000,000 |  |  |  |  |
Price per unit | $ / shares |  |  |  |  | $ 12.50 |  |  |  |  |
Gross proceeds from units sold to investors | $ |  |  |  |  | $ 12,500,000 |  |  |  |  |
Proceeds from sale of stock | $ |  |  |  |  | $ 11,985,000 |  |  |  |  |
Warrant expiration period |  |  |  |  |  | 2009-11 |  |  |  |
November 2009 Financing [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |
Number of securities callable by each warrant or right warrants |  |  |  |  | 0.40 |  |  |  |  |
Exercise price of warrants | $ / shares |  |  |  |  | $ 15.00 |  |  |  |  |
Number of securities callable by warrants |  |  |  |  | 400,000 |  |  |  |  |
Number of warrants in each unit sold to institutional investors | $ / Institutions |  |  |  |  | 1 |  |  |  |  |
December 2011 Financing [Member] |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |
Price per unit | $ / shares |  |  |  |  |  |  |  |  |  | $ 1.25
Proceeds from issuance of common stock and warrants | $ |  |  |  |  |  |  |  |  |  | $ 10,000,000
Number of Series A warrants in each unit issued in public offering | $ / Stock_Unit |  |  |  |  |  |  |  |  |  | 1
December 2011 Financing [Member] | Series B Warrants [Member] |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |
Exercise price of warrants | $ / shares |  |  |  | $ 1.25 |  |  |  |  |  | $ 1.25
Number of securities callable by warrants |  |  |  | 8,000,000 |  |  |  |  |  | 8,000,000
Term of warrant |  |  |  | 90 days |  |  |  |  |  | 90 days
Warrant expiration date |  |  |  |  |  | May 02, 2012 |  |  |  |
Number of warrants exercised |  |  |  |  |  |  |  |  | 2,700,000 |
Number of warrants expired |  |  |  |  |  | 5,300,000 |  |  | 5,300,000 |
December 2011 Financing [Member] | Series A Warrants [Member] |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |
Number of securities callable by each warrant or right warrants |  |  |  |  |  | 1 |  |  |  |
Number of securities callable by warrants |  |  |  | 8,000,000 |  |  |  |  |  | 8,000,000
Term of warrant |  |  |  | 5 years |  |  |  |  |  |
Number of warrants exercised |  |  |  |  |  |  | 1,180,015 | 384,534 | 2,198,571 |
Number of warrants issued upon Series B warrants exercise |  |  |  |  |  |  |  |  | 2,700,000 |
December 2011 Financing [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |
Number of securities callable by each warrant or right warrants |  |  |  | 1 |  | 1 |  |  |  | 1
Number of shares issued upon warrants exercise |  |  |  |  |  |  |  |  | 2,700,000 |
December 2011 Financing [Member] | Common Stock [Member] | Series B Warrant [Member] |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares issued upon warrants exercise |  |  |  |  |  |  |  |  | 2,700,000 |
December 2011 Financing [Member] | Common Stock [Member] | Series A Warrants [Member] |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |
Exercise price of warrants | $ / shares |  |  |  | $ 1.40 |  |  |  |  |  | $ 1.40
Number of shares issued upon warrants exercise |  |  |  |  |  |  | 1,180,015 | 384,534 | 2,198,571 |
December 2011 Financing [Member] | Capital Units [Member] |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |
Number of securities callable by warrants |  |  |  | 8,000,000 |  |  |  |  |  | 8,000,000
December 2011 Financing [Member] | Capital Units [Member] | Series B Warrant [Member] |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |
Warrant expiration period |  |  |  |  |  | 2016-12 |  |  |  |
December 2011 Financing [Member] | Capital Units [Member] | Series A Warrants [Member] |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |
Number of securities callable by each warrant or right warrants |  |  |  | 1 |  |  |  |  |  | 1
April 2015 Financing [Member] | Common Stock [Member] | Series A Warrants [Member] |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |
Exercise price of warrants | $ / shares | $ 0.70 |  |  |  |  | $ 0.52 |  |  |  |

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