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Stockholders' Equity - Stock Option Activities (Details) - Employee Stock Options - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Number of Shares |  |  |
Outstanding, beginning balance | 6,092 |  |
Options granted | 867 |  |
Options exercised | (982) |  |
Options forfeited or expired | (421) |  |
Outstanding, ending balance | 5,556 | 6,092 |
Weighted Average Exercise Price |  |  |
Outstanding, beginning balance, weighted-average exercise price | $ 4.58 |  |
Options granted, weighted-average exercise price | 9.48 |  |
Options exercised, weighted-average exercise price | 4.37 |  |
Options forfeited or expired, weighted-average exercise price | 6.56 |  |
Outstanding, ending balance, weighted-average exercise price | $ 5.23 | $ 4.58 |
Weighted average remaining contractual life | 5 years 10 months 24 days |  |
Outstanding, Aggregate intrinsic value | $ 49,895 |  |
Vested and expected to vest as of December 31, 2016 |  |  |
Vested and expected to vest, shares | 5,489 |  |
Exercisable, shares | 4,065 |  |
Outstanding, weighted-average exercise price | $ 5.18 |  |
Exercisable, weighted-average exercise price | $ 4.13 |  |
Outstanding, weighted average remaining contractual life | 5 years 10 months 24 days |  |
Exercisable, weighted average remaining contractual life | 5 years |  |
Vested and expected to vest, aggregate intrinsic value | $ 49,570 |  |
Exercisable, aggregate intrinsic value | $ 40,996 |  |
Fair market value of common stock | $ 14.19 |  |
Weighted-average grant date fair value per share of options granted | $ 4.50 | $ 2.38 | $ 3.42
Intrinsic value of options exercised | $ 5,865 | $ 3,233 | $ 9,808
Proceeds from exercise of common stock options | $ 4,286 | $ 1,268 | $ 1,127

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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + 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 (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance 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)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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