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Selected Quarterly Financial Data (Unaudited) - Allocation of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Total stock-based compensation	$ 4,640	$ 3,720	$ 3,854	$ 3,129	$ 2,716	$ 2,519	$ 2,414	$ 1,994	$ 15,343	$ 9,643	$ 7,730
Cost of revenue
Total stock-based compensation	594	599	575	434	424	357	329	265
Research and development
Total stock-based compensation	807	797	801	637	549	547	528	435
Sales and marketing
Total stock-based compensation	1,128	1,084	1,224	928	759	626	544	434
General and administrative
Total stock-based compensation	$ 2,111	$ 1,240	$ 1,254	$ 1,130	$ 984	$ 989	$ 1,013	$ 860

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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=98514028&loc=d3e3602-108585

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