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Equity - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Sep. 30, 2013
Mar. 11, 2014
Stock Incentive Plan 2011
Jan. 08, 2014
Stock Incentive Plan 2011
Dec. 31, 2013
Stock Incentive Plan 2011
Group 2
Mar. 11, 2014
Stock Incentive Plan 2011
Restricted Stock Units (RSUs)
Jan. 08, 2014
Stock Incentive Plan 2011
Restricted Stock Units (RSUs)
Jan. 31, 2013
Stock Incentive Plan 2011
Restricted Stock Units (RSUs)
Jan. 08, 2014
Stock Incentive Plan 2011
Stock Options
Stockholders Equity Note [Line Items]                    
Refund of equity issuance costs $ 3,191 $ 3,191                
Shares issued, exercise of stock options   234,500 386,000              
Gross proceeds from exercise of stock options   307 627              
Net proceeds from exercise of stock options   307 627              
Shares issued, exercise of warrants   1,684,888 120,000              
Gross proceeds from exercise of warrants   1,651 120              
Net proceeds from exercise of warrants   $ 1,651 $ 120              
Stock units, Granted             173,348 2,082,000 454,875  
Stock options, Granted       205,890 2,605,500          
Stock options, Vesting Period               3 years   4 years
Restricted stock units, issued as a result of vesting           0