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Stockholders' Equity - Summary of Stock Option Award Activity (Details) - Stock Options - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Weighted-Average Exercise Price |  |
Weighted-Average Exercise Price, Beginning balance | $ 7.83 |
Weighted-Average Exercise Price, Exercised | 2.93 |
Weighted-Average Exercise Price, Forfeited | 13.58 |
Weighted-Average Exercise Price, Ending balance | $ 8.10 | $ 7.83
Weighted-Average Remaining Contractual Term |  |
Weighted-Average Remaining Contractual Term (in years) | 5 years 11 months 23 days | 6 years 4 months 28 days
Aggregate Intrinsic Value |  |
Aggregate Intrinsic Value, Outstanding | $ 34,567 |
Aggregate Intrinsic Value, Outstanding | $ 61,054 | $ 34,567
Class A Common Stock |  |
Number of Shares |  |
Number of Shares, Beginning balance | 13,322 |
Number of Shares, Exercised | (1,260) |
Number of Shares, Forfeited | (969) |
Number of Shares, Ending balance | 11,093 | 13,322
Class B Common Stock |  |
Number of Shares |  |
Number of Shares, Beginning balance | 2,969 |
Number of Shares, Exercised | (651) |
Number of Shares, Forfeited | (29) |
Number of Shares, Ending balance | 2,289 | 2,969

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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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