Business Combinations - Additional Information (Detail) - USD ($)			3 Months Ended				9 Months Ended
	Jan. 02, 2019	Nov. 01, 2018	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Business Acquisition [Line Items]
Goodwill					$ 10,238,000		$ 10,204,000
Business combination reduction in earnout consideration expense						$ (175,000)	$ 261,000	$ (175,000)
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			85,324
Product revenue to be achieved to obligate earnout consideration		$ 11,000,000
Amount of additional earnout consideration of payable in shares of common stock		2,500,000
Amount of maximum earnout consideration of payable for all periods in shares of common stock		7,500,000
Goodwill		3,600,000
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 earnout consideration		15,000,000
Amount of earnout consideration of payable in shares of common stock		7,500,000
Product revenue to be achieved to obligate additional earnout consideration		15,000,000
Thursby Software Systems | Minimum
Business Acquisition [Line Items]
Product revenue to be achieved to obligate earnout consideration		8,000,000
Product revenue to be achieved to obligate additional earnout 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	31,447			31,447
Amount of maximum earnout consideration of payable for all periods in shares of common stock	$ 3,500,000
Goodwill	1,200,000
Fair value of earnout consideration	200,000		$ 489,000		$ 750,000
Business combination issued to selling stockholder earnout consideration of shares			157,233
Business combination reduction in earnout consideration expense			$ 261,000
Viscount Systems, Inc. | Maximum
Business Acquisition [Line Items]
Amount of earnout consideration of payable in shares of common stock	3,500,000
Amount of additional earnout consideration of payable in shares of common stock	$ 2,250,000