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Stock Options and Warrants - Series B Warrant Exercises - Additional Information (Detail) - USD ($)
6 Months Ended 12 Months Ended
Jun. 20, 2015
Jun. 30, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Proceeds from exercise of warrants   $ 431,000  
Number of warrants exercised   64,113 39,295
Unexercised outstanding shares expired   206,815  
Series B Warrants [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Proceeds from exercise of warrants   $ 83,388 $ 339,506
Number of warrants exercised   12,409 39,295
Unexercised outstanding shares expired 206,815