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Stockholders' Equity - Stock-Based Compensation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Stock-based Compensation Expense
Stock-based compensation expense	$ 15,343	$ 9,643	$ 7,730
Employee Stock Options
Stock-based Compensation Expense
Unrecognized stock-based compensation expense	$ 10,703
Weighted-average amortization period	2 years 6 months
Restricted Stock Units
Stock-based Compensation Expense
Unrecognized stock-based compensation expense	$ 26,401
Weighted-average amortization period	2 years 9 months 18 days
ESPP
Stock-based Compensation Expense
Unrecognized stock-based compensation expense	$ 670
Weighted-average amortization period	4 months 24 days
Cost of revenue
Stock-based Compensation Expense
Stock-based compensation expense	$ 2,202	1,375	866
Research and development
Stock-based Compensation Expense
Stock-based compensation expense	3,042	2,059	1,790
Sales and marketing
Stock-based Compensation Expense
Stock-based compensation expense	4,364	2,363	1,800
General and administrative
Stock-based Compensation Expense
Stock-based compensation expense	5,735	$ 3,846	$ 3,274
Board of Directors Executive Chairman | General and administrative
Stock-based Compensation Expense
Stock-based compensation expense	$ 1,000

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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
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Unrecognized cost of unvested share-based compensation awards.

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