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Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended | 6 Months Ended
--- | --- | ---
Jan. 31, 2013 | Feb. 29, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Stockholders Equity Note [Line Items] |  |  |  |
Shares issued, exercise of stock options |  |  | 319,750 | 2,485,647
Gross proceeds from exercise of stock options |  |  | $ 0.5 | $ 6.7
Net proceeds from exercise of stock options |  |  | 0.5 | 6.7
Shares issued, exercise of warrants |  |  | 70,000 | 9,812,622
Gross proceeds from exercise of warrants |  |  | 0.1 | 15.0
Net proceeds from exercise of warrants |  |  | 0.1 | 14.9
Restricted Stock Units (RSUs) |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |
Restricted stock units granted | 434,875 | 584,400 |  |
Restricted stock units, expiration date | Aug. 03, 2015 | Feb. 01, 2015 |  |
Restricted stock units, Expenses |  |  | $ 0.3 | $ 1.0

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