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Acquisition - Additional Information (Detail) - USD ($)		9 Months Ended
	Aug. 23, 2018	Sep. 30, 2018
Business Acquisition [Line Items]
Business acquisition, fair value of common stock		$ 8,180,000
Alert Labs Inc
Business Acquisition [Line Items]
Business acquisition, cash consideration	$ 5,889,000
Business acquisition, issuance of shares of common stock	47,103
Business acquisition, fair value of common stock	$ 8,180,000

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