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Segment information - Schedule of Revenue by Geography Based on Customer Location (Detail) - 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
Revenue:
Revenue		$ 59,230	$ 57,248	$ 53,024	$ 50,766	$ 54,193	$ 52,176	$ 41,043	$ 39,424	$ 220,268	$ 186,836	$ 14,091
United States [Member]
Revenue:
Revenue										211,307	167,568	12,816
Outside of the United States [Member]
Revenue:
Revenue	[1]									$ 8,961	$ 19,268	$ 1,275
[1] No individual country, other than disclosed above, exceeded 10% of our total consolidated revenue for any period presented

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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- References

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