Summary of Unvested Stock Option Activity (Detail) - $ / shares shares in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
|
| Weighted Average Grant Date Fair Value | ||
| Granted | $ 0.29 | $ 1.05 |
| Stock Options | ||
| Shares | ||
| Beginning Balance | 3,283 | |
| Granted | 2,519 | |
| Vested | (630) | |
| Forfeited or cancelled | (38) | |
| Ending Balance | 5,134 | |
| Weighted Average Grant Date Fair Value | ||
| Beginning Balance | $ 0.95 | |
| Granted | 0.29 | |
| Vested | 0.83 | |
| Forfeited or cancelled | 1.19 | |
| Ending Balance | $ 0.69 | |
| X | ||||||||||
- Definition Gross number of share options (or share units) granted during the period. No definition available.
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| X | ||||||||||
- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Number of non-vested options outstanding. No definition available.
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| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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| X | ||||||||||
- Definition Number of non-vested options forfeited. No definition available.
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| X | ||||||||||
- Definition Weighted average grant-date fair value of non-vested options forfeited. No definition available.
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| X | ||||||||||
- Definition Weighted average grant-date fair value of non-vested options outstanding. No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Number of options vested. No definition available.
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| X | ||||||||||
- Definition Weighted average grant-date fair value of options vested. No definition available.
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| X | ||||||||||
- Details
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