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Acquisitions - Summary of Preliminary Allocation of Purchase Price to Fair Value of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) - USD ($) $ in Thousands		12 Months Ended
	Jul. 06, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Amortization of intangible assets		$ 1,162	$ 781	$ 831
FeedbackNow [Member]
Business Acquisition [Line Items]
Acquired intangible assets	$ 4,780
Acquired intangible assets, Useful life	4 years 9 months 18 days
Amortization of intangible assets		$ 400
FeedbackNow [Member] | Technology Asset Class [Member]
Business Acquisition [Line Items]
Acquired intangible assets	$ 3,000
Acquired intangible assets, Useful life	6 years 6 months
FeedbackNow [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Acquired intangible assets	$ 1,300
Acquired intangible assets, Useful life	6 years 1 month 6 days
FeedbackNow [Member] | Customer Relationships [Member] | Minimum [Member]
Business Acquisition [Line Items]
Acquired intangible assets, Useful life	4 years 6 months
FeedbackNow [Member] | Customer Relationships [Member] | Maximum [Member]
Business Acquisition [Line Items]
Acquired intangible assets, Useful life	7 years 6 months
FeedbackNow [Member] | Trade Names [Member]
Business Acquisition [Line Items]
Acquired intangible assets	$ 500
Acquired intangible assets, Useful life	8 years 6 months

X

- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

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