Acquisitions - Narrative (Details) - USD ($) $ in Thousands			3 Months Ended	6 Months Ended
	Dec. 18, 2019	Sep. 30, 2019	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Business Acquisition [Line Items]
Working capital for acquisitions			$ 200	$ 172	$ 0
Goodwill			41,214	41,214		$ 41,386
3M's Drive-Thru Communications Systems
Business Acquisition [Line Items]
Business acquisition, purchase price		$ 8,400
Fair value of assets acquired		8,400
Warranty liability assumed		1,400
Business acquisition, cash paid		7,000
Revenue of acquiree			4,000	7,500
Goodwill		2,400
3M's Drive-Thru Communications Systems | Developed technology
Business Acquisition [Line Items]
Finite-lived intangible assets		1,200
3M's Drive-Thru Communications Systems | Customer relationships
Business Acquisition [Line Items]
Finite-lived intangible assets		$ 3,600
Restaurant Magic
Business Acquisition [Line Items]
Fair value of assets acquired	$ 47,517
Business acquisition, cash paid	$ 12,800
Percent acquired	100.00%
Consideration	$ 42,833
Equity issued	27,500
Contingent consideration liability			3,300	3,300		$ 3,300
Revenue of acquiree			$ 1,800	$ 4,000
Goodwill	27,773
Restaurant Magic | Developed technology
Business Acquisition [Line Items]
Finite-lived intangible assets	16,400
Restaurant Magic | Customer relationships
Business Acquisition [Line Items]
Finite-lived intangible assets	$ 1,100
Restaurant Magic | Cash Or Subordinated Promissory Notes
Business Acquisition [Line Items]
Percent of contingent consideration	50.00%
Restaurant Magic | Restricted Shares Of Common Stock
Business Acquisition [Line Items]
Percent of contingent consideration	50.00%
Restaurant Magic | Subordinate Promissory Note
Business Acquisition [Line Items]
Warranty liability assumed	$ 2,000