Business Combinations - Additional Information (Detail) - USD ($)							3 Months Ended		12 Months Ended
	Feb. 14, 2019	Jan. 25, 2019	Jan. 02, 2019	Nov. 01, 2018	May 09, 2018	Feb. 14, 2018	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill								$ 10,441,000		$ 9,286,000
3VR
Business Acquisition [Line Items]
Date of acquisition completed						Feb. 14, 2018		Feb. 14, 2018
Business combination, aggregate consideration						$ 6,200,000
Business combination, payment of cash						1,600,000
Business combination, issuance of notes						$ 2,000,000
Business combination, issuance of common stock, shares						609,830
Business combination, issuance of common stock						$ 2,300,000
Business combination, issuance of common stock value held back		$ 300,000
Business combination, issuance of common stock shares held back		93,406				294,927
Reduction in purchase consideration					$ 660,000
Reduction in goodwill					$ 660,000
Business combination, cancellation of common stock shares held back					181,319
Product shipments have to be achieved to obligate earn-out consideration						$ 24,100,000
Amount of earn-out consideration of payable in shares of common stock						3,500,000
Potential maximum earn-out value						7,000,000
Amount of shipments should exceed to obligate potential maximum earn-out value						48,200,000
Goodwill						5,796,000
3VR | ASC 805
Business Acquisition [Line Items]
Acquisition and transitional costs								$ 8,000		548,000
3VR | Notes Payable
Business Acquisition [Line Items]
Business combination, issuance of notes						2,000,000
Debt instrument payment, principal and interest	$ 2,060,000
3VR | Scenario, Forecast
Business Acquisition [Line Items]
Reduction in purchase consideration							$ 340,000
Reduction in goodwill							$ 340,000
Business combination, cancellation of common stock shares held back							93,406
Percentage of contingent consideration obligated to pay									35.00%
Amount of contingent consideration obligated to pay for each subject adjustments									$ 25,000,000
3VR | Maximum
Business Acquisition [Line Items]
Business combination, issuance of common stock value held back						$ 1,000,000
Thursby Software Systems
Business Acquisition [Line Items]
Date of acquisition completed				Nov. 01, 2018
Business combination, aggregate consideration				$ 3,100,000
Business combination, payment of cash				$ 600,000
Business combination, issuance of common stock, shares				426,621
Business combination, issuance of common stock				$ 2,500,000
Business combination, issuance of common stock shares held back				85,324
Goodwill				$ 3,490,000
Product revenue to be achieved to obligate earn-out consideration				11,000,000
Amount of additional earn-out consideration of payable in shares of common stock				2,500,000
Amount of maximum earn-out consideration of payable for all periods in shares of common stock				7,500,000
Thursby Software Systems | ASC 805
Business Acquisition [Line Items]
Acquisition and transitional costs								23,000		208,000
Thursby Software Systems | Maximum
Business Acquisition [Line Items]
Business combination, issuance of common stock value held back				500,000
Product revenue to be achieved to obligate earn-out consideration				15,000,000
Amount of earn-out consideration of payable in shares of common stock				7,500,000
Product revenue to be achieved to obligate additional earn-out consideration				15,000,000
Thursby Software Systems | Minimum
Business Acquisition [Line Items]
Product revenue to be achieved to obligate earn-out consideration				8,000,000
Product revenue to be achieved to obligate additional earn-out consideration				$ 15,000,000
Viscount Systems, Inc.
Business Acquisition [Line Items]
Date of acquisition completed			Jan. 02, 2019
Business combination, aggregate consideration			$ 2,900,000
Business combination, payment of cash			$ 1,300,000
Business combination, issuance of common stock, shares			419,288
Business combination, issuance of common stock			$ 1,600,000
Business combination, issuance of common stock shares held back			31,446
Goodwill			$ 1,173,000
Amount of maximum earn-out consideration of payable for all periods in shares of common stock			3,500,000
Fair value of earn out consideration			200,000					200,000
Viscount Systems, Inc. | ASC 805
Business Acquisition [Line Items]
Acquisition and transitional costs								$ 27,000		$ 227,000
Viscount Systems, Inc. | Maximum
Business Acquisition [Line Items]
Amount of earn-out consideration of payable in shares of common stock			3,500,000
Amount of additional earn-out consideration of payable in shares of common stock			$ 2,250,000