Common Stock - Summary of Stock Options Activity (Detail) - $ / shares |
6 Months Ended | |
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Jun. 30, 2015 |
Jun. 30, 2014 |
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| Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] | ||
| Number of Optioned Common Shares, Beginning Balance | 1,283,419 | |
| Number of Optioned Common Shares, Granted | 456,797 | |
| Number of Optioned Common Shares, Exercised | 0 | (10,000) |
| Number of Optioned Common Shares, Forfeited | (17,370) | |
| Number of Optioned Common Shares, Ending Balance | 1,722,846 | |
| Weighted Average Exercise Price, Beginning Balance | $ 10.55 | |
| Weighted Average Exercise Price, Granted | 1.87 | |
| Weighted Average Exercise Price, Forfeited | 12.59 | |
| Weighted Average Exercise Price, Ending Balance | $ 8.23 | |
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- References No definition available.
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Gross number of share options (or share units) granted during the period. No definition available.
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- Definition Number of options outstanding, including both vested and non-vested options. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. No definition available.
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. No definition available.
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- Definition Number of share options (or share units) exercised during the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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