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Stockholders' Equity - Stock-based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Stock-based Compensation Expense
Stock-based compensation expense	$ 6,797	$ 3,854	$ 12,122	$ 6,983
Cost of revenue
Stock-based Compensation Expense
Stock-based compensation expense	853	575	1,531	1,009
Research and development
Stock-based Compensation Expense
Stock-based compensation expense	1,064	801	1,941	1,438
Sales and marketing
Stock-based Compensation Expense
Stock-based compensation expense	1,585	1,224	2,947	2,152
General and administrative
Stock-based Compensation Expense
Stock-based compensation expense	3,295	$ 1,254	5,703	$ 2,384
Stock options
Stock-based Compensation Expense
Unrecognized stock-based compensation expense	11,366		$ 11,366
Weighted-average amortization period			2 years 7 months 1 day
Restricted stock units
Stock-based Compensation Expense
Unrecognized stock-based compensation expense	56,023		$ 56,023
Weighted-average amortization period			3 years 12 days
ESPP
Stock-based Compensation Expense
Unrecognized stock-based compensation expense	$ 708		$ 708
Weighted-average amortization period			5 months

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.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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