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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
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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 |  |  |  |

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