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Option Activity under Stock-Based Compensation Plans (Detail) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) $ / shares shares
Shares Underlying Outstanding Options |
Beginning balance | shares | 3,975
Options granted | shares | 535
Options exercised | shares | (144)
Ending balance | shares | 3,555
Vested and expected to vest at December 31, 2017 | shares | 3,533
Exercisable at December 31, 2017 | shares | 2,294
Weighted-Average Exercise Price Per Share |
Beginning balance | $ / shares | $ 21.38
Options granted | $ / shares | 12.23
Options exercised | $ / shares | 14.28
Ending balance | $ / shares | 19.56
Vested and expected to vest at December 31, 2017 | $ / shares | 19.56
Exercisable at December 31, 2017 | $ / shares | $ 21.35
Weighted-Average Remaining Contractual Term (years) |
Balance at December 31, 2017 | 6 years 14 days
Vested and expected to vest at December 31, 2017 | 6 years 14 days
Exercisable at December 31, 2017 | 5 years 9 months 7 days
Aggregate Intrinsic Value |
Balance at December 31, 2017 | $ | $ 7,477
Vested and expected to vest at December 31, 2017 | $ | 7,468
Exercisable at December 31, 2017 | $ | $ 2,702
Unvested |
Shares Underlying Outstanding Options |
Options cancelled | shares | (400)
Weighted-Average Exercise Price Per Share |
Options cancelled | $ / shares | $ 18.30
Vested |
Shares Underlying Outstanding Options |
Options cancelled | shares | (411)
Weighted-Average Exercise Price Per Share |
Options cancelled | $ / shares | $ 30.78

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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