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Acquisitions - Additional Information (Detail) - USD ($) shares in Millions	1 Months Ended	3 Months Ended
	Nov. 30, 2018	Mar. 31, 2019
Telmetrics Acquisition
Business Acquisition [Line Items]
Business acquisition, percentage of voting interests acquired	100.00%
Cash paid for business acquisition	$ 10,100,000
Maximum contingent consideration cash payable on acquisition	$ 3,000,000
Contingent consideration, description	Up to $3.0 million in cash based upon the achievement of targeted financial goals over the two (2) twelve (12) month periods following the acquisition date.
Minimum contingent consideration cash payable on acquisition	$ 0
Business combination contingent consideration payment to employees	450,000
Fair value of contingent consideration	$ 1,600,000	$ 1,600,000
Indemnification obligations period	18 months
Identifiable intangible assets		$ 6,351,000
Weighted average useful life		3 years 7 months 6 days
Finite-lived intangible assets, amortization method		straight-line method
Total consideration	$ 11,700,000
Telmetrics Acquisition | Minimum
Business Acquisition [Line Items]
Acquired identifiable intangible assets amortization period		24 months
Telmetrics Acquisition | Maximum
Business Acquisition [Line Items]
Acquired identifiable intangible assets amortization period		60 months
Callcap Acquisition
Business Acquisition [Line Items]
Business acquisition, percentage of voting interests acquired	100.00%
Cash paid for business acquisition	$ 24,993,000
Indemnification obligations period	18 months
Identifiable intangible assets		$ 15,128,000
Weighted average useful life		4 years 1 month 6 days
Finite-lived intangible assets, amortization method		straight-line method
Total consideration	$ 35,010,000
Callcap Acquisition | Class B
Business Acquisition [Line Items]
Stock issued during the period, shares	3.4
Stock issued during the period, value	$ 10,000,000
Common stock issuance period	4 years
Callcap Acquisition | Minimum
Business Acquisition [Line Items]
Acquired identifiable intangible assets amortization period		24 months
Callcap Acquisition | Maximum
Business Acquisition [Line Items]
Acquired identifiable intangible assets amortization period		60 months

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