Summary of Fair Values of Assets Acquired and Liabilities Assumed at Acquisition (Detail) - USD ($)	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019	Jan. 02, 2019
Business Acquisition [Line Items]
Goodwill	$ 10,266,000		$ 10,238,000
Viscount Systems, Inc.
Business Acquisition [Line Items]
Accounts receivable				$ 636,000
Inventory				249,000
Prepaid expenses and other current assets				29,000
Property and equipment				190,000
Operating lease ROU assets				550,000
Finite-lived intangibles				1,670,000
Total identifiable assets acquired				3,324,000
Accounts payable				(372,000)
Operating lease liabilities				(61,000)
Accrued expenses and liabilities				(120,000)
Deferred revenue				(34,000)
Earnout consideration liability		$ (489,000)	$ (750,000)	(200,000)
Other current liabilities				(326,000)
Long-term operating lease liabilities				(489,000)
Total liabilities assumed				(1,602,000)
Net identifiable assets acquired				1,722,000
Goodwill				1,200,000
Net purchase price				2,922,000
Viscount Systems, Inc. | Trademarks
Business Acquisition [Line Items]
Finite-lived intangibles				160,000
Viscount Systems, Inc. | Customer Relationships
Business Acquisition [Line Items]
Finite-lived intangibles				710,000
Viscount Systems, Inc. | Developed Technology
Business Acquisition [Line Items]
Finite-lived intangibles				$ 800,000