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Selected Quarterly Financial Date (Unaudited) - Allocation of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Total stock-based compensation	$ 2,716	$ 2,519	$ 2,414	$ 1,994	$ 1,720	$ 1,945	$ 1,830	$ 2,235	$ 9,643	$ 7,730	$ 6,753
Cost of Revenue
Total stock-based compensation	424	357	329	265	227	233	218	188
Research and Development
Total stock-based compensation	549	547	528	435	401	475	340	574
Sales and Marketing
Total stock-based compensation	759	626	544	434	370	448	458	524
General and Administrative
Total stock-based compensation	$ 984	$ 989	$ 1,013	$ 860	$ 722	$ 789	$ 814	$ 949

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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