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Warrant Liability - Additional Information (Detail) | 1 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2011 $ / shares shares | Jun. 30, 2016 USD ($) $ / shares shares | Jun. 30, 2015 USD ($) | Dec. 31, 2014 USD ($) shares | Dec. 31, 2013 USD ($) shares | Dec. 31, 2012 USD ($) shares | Dec. 31, 2011 USD ($) $ / shares $ / Stock_Unit shares | Apr. 30, 2015 $ / shares
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |
Term of warrant | 5 years |  |  |  |  |  |  |  |
Proceeds from issuance of stock units | $ |  |  | $ 7,259,613 | $ 24,942,963 |  |  |  |  |
Warrant expiration period | 2 years |  |  |  |  |  |  |  |
Dividend yield |  |  | 0.00% |  |  |  |  |  |
Series B Warrants [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |
Number of securities callable by each warrant or right warrants | 0.75 |  |  |  |  |  |  |  |
Exercise price of warrants | $ / shares | $ 5.04 |  |  |  |  |  |  |  |
Number of additional warrants issued | 249,709 |  |  |  |  |  |  |  |
Series A Warrants [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |
Number of securities callable by each warrant or right warrants | 0.50 |  |  |  |  |  |  |  |
Exercise price of warrants | $ / shares | $ 3.60 |  |  |  |  |  |  |  |
Number of additional warrants issued | 166,473 |  |  |  |  |  |  |  |
Proceeds from sale of stock | $ |  |  |  |  | $ 1,652,000 | $ 538,000 | $ 3,078,000 |  |
Common Stock [Member] | Series A Warrants [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |
Exercise price of warrants | $ / shares |  |  |  |  |  |  |  |  | $ 8.40
December 2011 Financing [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock and warrants | $ |  |  |  |  |  |  |  | $ 10,000,000 |
Price per unit | $ / shares |  |  |  |  |  |  |  | $ 15.00 |
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] |  |  |  |  |  |  |  |  |
Number of securities callable by warrants |  | 666,667 |  |  |  |  |  | 666,667 |
Term of warrant |  | 90 days |  |  |  |  |  | 90 days |
Warrant expiration date |  |  | May 02, 2012 |  |  |  |  |  |
Exercise price of warrants | $ / shares |  | $ 15.00 |  |  |  |  |  | $ 15.00 |
Number of warrants exercised |  |  |  |  |  |  | 225,000 |  |
Number of warrants expired |  |  | 441,667 |  |  |  | 441,667 |  |
December 2011 Financing [Member] | Series A Warrants [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |
Number of securities callable by warrants |  | 666,667 |  |  |  |  |  | 666,667 |
Term of warrant |  | 5 years |  |  |  |  |  |  |
Number of securities callable by each warrant or right warrants |  |  | 1 |  |  |  |  |  |
Number of warrants exercised |  |  |  |  | 98,335 | 32,045 | 183,215 |  |
Number of additional warrants issued |  |  |  |  |  |  | 225,000 |  |
Dividend yield |  |  | 0.00% |  |  |  |  |  |
December 2011 Financing [Member] | Capital Units [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |
Number of securities callable by warrants |  | 666,667 |  |  |  |  |  | 666,667 |
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 |
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 |  |  |  |  |  |  | 225,000 |  |
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 |  |  |  |  |  |  | 225,000 |  |
December 2011 Financing [Member] | Common Stock [Member] | Series A Warrants [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |
Exercise price of warrants | $ / shares |  | $ 16.80 |  |  |  |  |  | $ 16.80 |
Number of shares issued upon warrants exercise |  |  |  |  | 98,335 | 32,045 | 183,215 |  |
April 2015 Financing [Member] | Common Stock [Member] | Series A Warrants [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |
Exercise price of warrants | $ / shares | $ 6.24 |  | $ 6.24 |  |  |  |  |  | $ 8.40
March 2016 Financing [Member] | Series B Warrants [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |
Dividend yield |  |  | 0.00% |  |  |  |  |  |
March 2016 Financing [Member] | Series A Warrants [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |
Dividend yield |  |  | 0.00% |  |  |  |  |  |
March 2016 Financing [Member] | Common Stock [Member] | Series A Warrants [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |
Exercise price of warrants | $ / shares | $ 3.60 |  | $ 3.60 |  |  |  |  |  |
Underwritten Public Offering [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |
Number of shares issued upon warrants exercise | 2,222,250 |  |  |  |  |  |  |  |
Proceeds from issuance of stock units | $ | $ 8,000,000 |  |  |  |  |  |  |  |
Number of stock units issued, price per share | $ / shares | $ 3.60 |  |  |  |  |  |  |  |
Over-Allotment-Option [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |
Number of securities callable by each warrant or right warrants | 416,672 |  |  |  |  |  |  |  |
Number of shares issued upon warrants exercise | 333,338 |  |  |  |  |  |  |  |
Underwriting option exercise period | 45 days |  |  |  |  |  |  |  |

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