Common Stock - Summary of Stock Options Activity (Detail) - $ / shares |
3 Months Ended | |
|---|---|---|
Mar. 31, 2017 |
Mar. 31, 2016 |
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| Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] | ||
| Number of Optioned Common Shares, Beginning Balance | 1,378,805 | |
| Number of Optioned Common Shares, Expired | (9,446) | |
| Number of Optioned Common Shares, Exercised | 0 | 0 |
| Number of Optioned Common Shares, Forfeited | (30,173) | |
| Number of Optioned Common Shares, Ending Balance | 1,339,186 | |
| Weighted Average Exercise Price, Beginning Balance | $ 8.62 | |
| Weighted Average Exercise Price, Expired | 21.05 | |
| Weighted Average Exercise Price, Forfeited | 5.75 | |
| Weighted Average Exercise Price, Ending Balance | $ 8.59 | |
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- References No definition available.
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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 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 of the plan that expired. No definition available.
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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 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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