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Stockholders' Equity - Summary of Total Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total	$ 162,556	$ 133,258
Cost of Revenue
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total	1,849	276
Research and Development
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total	112,242	77,815
Sales and Marketing
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total	17,760	16,185
General and Administrative
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total	$ 30,705	$ 38,982

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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No definition available.

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