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Stock Options and Warrants - Summary of Changes in Restricted Stock Award Activity (Detail) - Under 2006 Plan and 2010 Plan [Member] - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares, Unvested, Beginning balance 968 968
Number of Shares, Granted 12,338 7,309
Number of Shares, Vested (13,306) (7,309)
Number of Shares, Unvested, Ending balance   968
Weighted Average Grant Date Fair Value, Unvested, Beginning balance $ 24.00 $ 34.50
Weighted Average Grant Date Fair Value, Granted 5.86 25.50
Weighted Average Grant Date Fair Value, Vested $ 7.13 27.00
Weighted Average Grant Date Fair Value, Unvested, Ending balance   $ 24.00