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Share-Based Compensation - Summary of Stock Options Outstanding (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Number of shares vested and exercisable | 557,311 | 410,236 | 448,371
Options vested and exercisable weighted average remaining contractual life | 5 years 4 months 6 days | 5 years 5 months 1 day | 5 years 26 days
Options vested and exercisable weighted average exercise price | $ 16.82 | $ 10.57 | $ 7.54
Options vested and exercisable intrinsic value | $ 11,080 | $ 9,224 | $ 7,029
$4.54 - 22.76 |  |  |
Range of exercise prices, lower range | $ 4.54 |  |
Range of exercise prices, upper range | $ 22.76 |  |
Number of shares vested and exercisable | 424,130 |  |
Options vested and exercisable weighted average remaining contractual life | 4 years 4 months 10 days |  |
Options vested and exercisable weighted average exercise price | $ 12.41 |  |
Options vested and exercisable intrinsic value | $ 10,303 |  |
$23.57 - 32.85 |  |  |
Range of exercise prices, lower range | $ 23.57 |  |
Range of exercise prices, upper range | $ 32.85 |  |
Number of shares vested and exercisable | 107,456 |  |
Options vested and exercisable weighted average remaining contractual life | 8 years 3 months 22 days |  |
Options vested and exercisable weighted average exercise price | $ 30.10 |  |
Options vested and exercisable intrinsic value | $ 709 |  |
$32.90 - 37.30 |  |  |
Range of exercise prices, lower range | $ 32.90 |  |
Range of exercise prices, upper range | $ 37.30 |  |
Number of shares vested and exercisable | 25,725 |  |
Options vested and exercisable weighted average remaining contractual life | 9 years 2 months 9 days |  |
Options vested and exercisable weighted average exercise price | $ 34.07 |  |
Options vested and exercisable intrinsic value | $ 68 |  |
$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 21 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 26 days
Options vested and exercisable weighted average exercise price |  |  | $ 15.31
Options vested and exercisable intrinsic value |  |  | $ 215

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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=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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