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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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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.

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Number of options outstanding, including both vested and non-vested options.

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-Publisher FASB
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-Topic 718
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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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-Publisher FASB
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Share-Based Compensation - Schedule of Information with Respect to Outstanding and Exercisable Stock Options (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Options Outstanding	3,085,888	2,657,723	3,781,964	3,900,435
Options Outstanding, Weighted Average Exercise Price	$ 11.18	$ 14.27	$ 12.88	$ 15.15
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	5 years 7 months 28 days
Options Exercisable, Number Exercisable	1,818,745
Options Exercisable, Weighted Average Exercise Price	$ 15.63
Range of Exercise Prices $2.65 - $3.93 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	2.65
Range of Exercise Prices, Maximum	$ 3.93
Options Outstanding, Number of Options Outstanding	363,248
Options Outstanding, Weighted Average Exercise Price	$ 3.27
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	7 years 7 days
Options Exercisable, Number Exercisable	334,942
Options Exercisable, Weighted Average Exercise Price	$ 3.32
Range of Exercise Prices $4.07 - $4.15 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	4.07
Range of Exercise Prices, Maximum	$ 4.15
Options Outstanding, Number of Options Outstanding	307,380
Options Outstanding, Weighted Average Exercise Price	$ 4.14
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	8 years 7 months 24 days
Options Exercisable, Number Exercisable	76,845
Options Exercisable, Weighted Average Exercise Price	$ 4.14
Range of Exercise Prices $4.49 - $4.49 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	4.49
Range of Exercise Prices, Maximum	$ 4.49
Options Outstanding, Number of Options Outstanding	683,104
Options Outstanding, Weighted Average Exercise Price	$ 4.49
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	9 years 2 months 5 days
Range of Exercise Prices $5.00 - $5.96 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 5.00
Range of Exercise Prices, Maximum	$ 5.96
Options Outstanding, Number of Options Outstanding	323,188
Options Outstanding, Weighted Average Exercise Price	$ 5.87
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	8 years 9 months 22 days
Options Exercisable, Number Exercisable	40,510
Options Exercisable, Weighted Average Exercise Price	$ 5.65
Range of Exercise Prices $6.51 - $8.63 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	6.51
Range of Exercise Prices, Maximum	$ 8.63
Options Outstanding, Number of Options Outstanding	434,420
Options Outstanding, Weighted Average Exercise Price	$ 8.01
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	2 years 8 months 12 days
Options Exercisable, Number Exercisable	391,900
Options Exercisable, Weighted Average Exercise Price	$ 8.09
Range of Exercise Prices $13.32 - $21.80 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	13.32
Range of Exercise Prices, Maximum	$ 21.80
Options Outstanding, Number of Options Outstanding	309,056
Options Outstanding, Weighted Average Exercise Price	$ 17.59
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	1 year 9 months 22 days
Options Exercisable, Number Exercisable	309,056
Options Exercisable, Weighted Average Exercise Price	$ 17.59
Range of Exercise Prices $22.04 - $26.15 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	22.04
Range of Exercise Prices, Maximum	$ 26.15
Options Outstanding, Number of Options Outstanding	312,144
Options Outstanding, Weighted Average Exercise Price	$ 22.55
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	2 years 5 months 23 days
Options Exercisable, Number Exercisable	312,144
Options Exercisable, Weighted Average Exercise Price	$ 22.55
Range of Exercise Prices $29.02 - $29.68 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	29.02
Range of Exercise Prices, Maximum	$ 29.68
Options Outstanding, Number of Options Outstanding	65,348
Options Outstanding, Weighted Average Exercise Price	$ 29.18
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	2 years 5 months 19 days
Options Exercisable, Number Exercisable	65,348
Options Exercisable, Weighted Average Exercise Price	$ 29.18
Range of Exercise Prices $30.67 - $30.67 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	30.67
Range of Exercise Prices, Maximum	$ 30.67
Options Outstanding, Number of Options Outstanding	168,000
Options Outstanding, Weighted Average Exercise Price	$ 30.67
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	2 years 7 months 24 days
Options Exercisable, Number Exercisable	168,000
Options Exercisable, Weighted Average Exercise Price	$ 30.67
Range of Exercise Prices $33.96 - $33.96 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	33.96
Range of Exercise Prices, Maximum	$ 33.96
Options Outstanding, Number of Options Outstanding	120,000
Options Outstanding, Weighted Average Exercise Price	$ 33.96
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	4 months 6 days
Options Exercisable, Number Exercisable	120,000
Options Exercisable, Weighted Average Exercise Price	$ 33.96