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Segment information - Schedule of Revenue by Geography Based on Customer Location (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Revenue:
Revenue		$ 50,766	$ 39,424
United States [Member]
Revenue:
Revenue		46,694	35,405
Outside of the United States [Member]
Revenue:
Revenue	[1]	$ 4,072	$ 4,019
[1] No individual country, other than disclosed above, exceeded 10% of 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

+ Details

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Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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- Details

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Namespace Prefix:
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X

- Details

Name:	us-gaap_StatementGeographicalAxis=us-gaap_NonUsMember
Namespace Prefix:
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Period Type: