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Selected Quarterly Financial Data (Unaudited) - Allocation of Depreciation and Amortization 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 depreciation and amortization	$ 2,068	$ 1,881	$ 2,270	$ 2,095	$ 2,086	$ 2,140	$ 2,060	$ 2,103	$ 8,314	$ 8,390	$ 7,388
Cost of revenue
Total depreciation and amortization	1,611	1,397	1,716	1,576	1,608	1,668	1,616	1,680
Research and development
Total depreciation and amortization	170	182	237	206	224	204	161	148
Sales and marketing
Total depreciation and amortization	30	30	30	30	58	56	54	53
General and administrative
Total depreciation and amortization	$ 257	$ 272	$ 287	$ 283	$ 196	$ 212	$ 229	$ 222

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- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ 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 (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

+ Details

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