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Stockholders' Equity - Stock-Based Compensation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stock-based Compensation Expense
Stock-based compensation expense	$ 9,643	$ 7,730	$ 6,753
Employee Stock Options
Stock-based Compensation Expense
Unrecognized stock-based compensation expense	$ 5,722
Weighted-average amortization period	2 years 4 months 8 days
Restricted Stock Units
Stock-based Compensation Expense
Unrecognized stock-based compensation expense	$ 12,619
Weighted-average amortization period	2 years 10 months 15 days
ESPP
Stock-based Compensation Expense
Unrecognized stock-based compensation expense	$ 409
Weighted-average amortization period	4 months 14 days
Cost of Revenue
Stock-based Compensation Expense
Stock-based compensation expense	$ 1,375	866	542
Research and Development
Stock-based Compensation Expense
Stock-based compensation expense	2,059	1,790	1,931
Sales and Marketing
Stock-based Compensation Expense
Stock-based compensation expense	2,363	1,800	1,510
General and Administrative
Stock-based Compensation Expense
Stock-based compensation expense	$ 3,846	$ 3,274	$ 2,770

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)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 718
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-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Staff Accounting Bulletin (SAB)
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Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 718
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- Definition

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.

+ References

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