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Share-Based Compensation - Summary of Stock Options Outstanding (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Number of shares vested and exercisable | 410,236 | 448,371 | 668,130
Options vested and exercisable weighted average remaining contractual life | 5 years 5 months | 5 years 27 days | 4 years 7 months 20 days
Options vested and exercisable weighted average exercise price | $ 10.57 | $ 7.54 | $ 6.36
Options vested and exercisable intrinsic value | $ 9,224 | $ 7,029 | $ 10,731
4.54-20.92 |  |  |
Range of exercise prices, lower range | $ 4.54 |  |
Range of exercise prices, upper range | $ 20.92 |  |
Number of shares vested and exercisable | 338,308 |  |
Options vested and exercisable weighted average remaining contractual life | 4 years 9 months |  |
Options vested and exercisable weighted average exercise price | $ 8.03 |  |
Options vested and exercisable intrinsic value | $ 8,465 |  |
20.96-26.50 |  |  |
Range of exercise prices, lower range | $ 20.96 |  |
Range of exercise prices, upper range | $ 26.50 |  |
Number of shares vested and exercisable | 71,928 |  |
Options vested and exercisable weighted average remaining contractual life | 8 years 6 months 22 days |  |
Options vested and exercisable weighted average exercise price | $ 22.50 |  |
Options vested and exercisable intrinsic value | $ 759 |  |
4.31-8.65 |  |  |
Range of exercise prices, lower range |  | $ 4.31 |
Range of exercise prices, upper range |  | $ 8.65 |
Number of shares vested and exercisable |  | 421,237 |
Options vested and exercisable weighted average remaining contractual life |  | 4 years 10 months 20 days |
Options vested and exercisable weighted average exercise price |  | $ 7.04 |
Options vested and exercisable intrinsic value |  | $ 6,814 |
8.70-22.76 |  |  |
Range of exercise prices, lower range |  | $ 8.70 |
Range of exercise prices, upper range |  | $ 22.76 |
Number of shares vested and exercisable |  | 27,134 |
Options vested and exercisable weighted average remaining contractual life |  | 7 years 9 months 25 days |
Options vested and exercisable weighted average exercise price |  | $ 15.31 |
Options vested and exercisable intrinsic value |  | $ 215 |
3.21-6.89 |  |  |
Range of exercise prices, lower range |  |  | $ 3.21
Range of exercise prices, upper range |  |  | $ 6.89
Number of shares vested and exercisable |  |  | 411,553
Options vested and exercisable weighted average remaining contractual life |  |  | 3 years 5 months 15 days
Options vested and exercisable weighted average exercise price |  |  | $ 5.16
Options vested and exercisable intrinsic value |  |  | $ 7,113
7.13-8.17 |  |  |
Range of exercise prices, lower range |  |  | $ 7.13
Range of exercise prices, upper range |  |  | $ 8.17
Number of shares vested and exercisable |  |  | 81,050
Options vested and exercisable weighted average remaining contractual life |  |  | 6 years 6 months 15 days
Options vested and exercisable weighted average exercise price |  |  | $ 7.27
Options vested and exercisable intrinsic value |  |  | $ 1,226
8.65-21.14 |  |  |
Range of exercise prices, lower range |  |  | $ 8.65
Range of exercise prices, upper range |  |  | $ 21.14
Number of shares vested and exercisable |  |  | 175,527
Options vested and exercisable weighted average remaining contractual life |  |  | 6 years 6 months 12 days
Options vested and exercisable weighted average exercise price |  |  | $ 8.76
Options vested and exercisable intrinsic value |  |  | $ 2,392

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- Definition 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 -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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