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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding, Number of Options Outstanding | 2,818,433 | 2,868,053 | 3,085,888 | 2,657,723
Options Outstanding, Weighted Average Exercise Price | $ 9.59 | $ 9.86 | $ 11.18 | $ 14.27
Options Outstanding, Weighted Average Remaining Contractual Term (in Years) | 6 years 1 month 20 days |  |  |
Options Exercisable, Number Exercisable | 1,847,335 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 10.13 |  |  |
Range of Exercise Prices $2.65 - $4.07 [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 | $ 4.07 |  |  |
Options Outstanding, Number of Options Outstanding | 326,324 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 3.57 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Term (in Years) | 5 years 9 months 21 days |  |  |
Options Exercisable, Number Exercisable | 312,162 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 3.54 |  |  |
Range of Exercise Prices $4.15 - $4.15 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, Minimum | 4.15 |  |  |
Range of Exercise Prices, Maximum | $ 4.15 |  |  |
Options Outstanding, Number of Options Outstanding | 250,732 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 4.15 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Term (in Years) | 6 years 7 months 9 days |  |  |
Options Exercisable, Number Exercisable | 188,049 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 4.15 |  |  |
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) | 7 years 2 months 4 days |  |  |
Options Exercisable, Number Exercisable | 341,552 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 4.49 |  |  |
Range of Exercise Prices $5.00 - $6.51 [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 | $ 6.51 |  |  |
Options Outstanding, Number of Options Outstanding | 346,012 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 6.00 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Term (in Years) | 5 years 9 months 3 days |  |  |
Options Exercisable, Number Exercisable | 316,904 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 6.01 |  |  |
Range of Exercise Prices $7.22 - $8.30 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, Minimum | 7.22 |  |  |
Range of Exercise Prices, Maximum | $ 8.30 |  |  |
Options Outstanding, Number of Options Outstanding | 324,832 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 8.07 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Term (in Years) | 7 years 4 months 28 days |  |  |
Options Exercisable, Number Exercisable | 138,007 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 7.76 |  |  |
Range of Exercise Prices $8.63 - $13.80 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, Minimum | 8.63 |  |  |
Range of Exercise Prices, Maximum | $ 13.80 |  |  |
Options Outstanding, Number of Options Outstanding | 377,061 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 12.65 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Term (in Years) | 8 years 8 months 8 days |  |  |
Options Exercisable, Number Exercisable | 104,429 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 9.65 |  |  |
Range of Exercise Prices $15.39 - $22.13 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, Minimum | 15.39 |  |  |
Range of Exercise Prices, Maximum | $ 22.13 |  |  |
Options Outstanding, Number of Options Outstanding | 312,712 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 20.66 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Term (in Years) | 3 years 3 days |  |  |
Options Exercisable, Number Exercisable | 248,576 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 22.02 |  |  |
Range of Exercise Prices $26.15 - $26.15 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, Minimum | 26.15 |  |  |
Range of Exercise Prices, Maximum | $ 26.15 |  |  |
Options Outstanding, Number of Options Outstanding | 36,144 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 26.15 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Term (in Years) | 1 month 24 days |  |  |
Options Exercisable, Number Exercisable | 36,144 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 26.15 |  |  |
Range of Exercise Prices $29.02 - $29.02 [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 | $ 29.02 |  |  |
Options Outstanding, Number of Options Outstanding | 41,512 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 29.02 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Term (in Years) | 1 year 2 months 1 day |  |  |
Options Exercisable, Number Exercisable | 41,512 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 29.02 |  |  |
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 | 120,000 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 30.67 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Term (in Years) | 1 year 4 months 17 days |  |  |
Options Exercisable, Number Exercisable | 120,000 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 30.67 |  |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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