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Stock Incentive Plans - Summary of Options Outstanding Vested and Expected to Vest (Detail) $ / shares in Units, $ in Thousands | 3 Months Ended
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Mar. 31, 2018 USD ($) $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Number of Shares, Vested | shares | 927,362
Number of Shares, Expected to vest | shares | 894,857
Number of Shares, Total | shares | 1,822,219
Weighted-average Exercise Price, Vested | $ / shares | $ 4.89
Weighted-average Exercise Price, Expected to vest | $ / shares | $ 4.41
Weighted-average Remaining Contractual Life (Years), Vested | 6 years 10 months 6 days
Weighted-average Remaining Contractual Life (Years), Expected to vest | 8 years 2 months 19 days
Aggregate Intrinsic Value, Vested | $ | $ 3,022
Aggregate Intrinsic Value, Expected to vest | $ | 3,188
Aggregate Intrinsic Value, Total | $ | $ 6,210

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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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