Common Stock - Summary of Stock Options Activity (Detail) |
3 Months Ended |
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Mar. 31, 2018
$ / shares
shares
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| Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] | |
| Number of Optioned Common Shares, Beginning Balance | shares | 1,115,647 |
| Number of Optioned Common Shares, Forfeited | shares | (3,241) |
| Number of Optioned Common Shares, Ending Balance | shares | 1,112,406 |
| Weighted Average Exercise Price, Beginning Balance | $ / shares | $ 7.99 |
| Weighted Average Exercise Price, Forfeited | $ / shares | 3.89 |
| Weighted Average Exercise Price, Ending Balance | $ / shares | $ 8.00 |
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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 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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