Acquisitions - Narrative (Details) - USD ($) $ in Thousands			12 Months Ended
	Dec. 18, 2019	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Value of the Earn-Out				$ 2,500
Acquisition-related expenses			$ 600
Restricted stock units
Business Acquisition [Line Items]
Restricted stock units vest in equal annual installments			3 years
3M's Drive-Thru Communications Systems
Business Acquisition [Line Items]
Business acquisition, purchase price		$ 8,400
Fair value of assets acquired		8,412
Warranty liability assumed		1,412
Business acquisition, cash paid		7,000
Warranty liability assumed, short-term		712
Warranty liability assumed, long-term		700
Consideration of business acquisition		$ 7,000
Restaurant Magic
Business Acquisition [Line Items]
Fair value of assets acquired	$ 47,689
Business acquisition, cash paid	$ 13,000
Percentage of interest acquired of limited liability company	100.00%
Consideration of business acquisition	$ 43,005
Business acquisition, paid in shares	27,500
Value of the Earn-Out			$ 3,300
Earn out liability (Maximum)	3,340
Restaurant Magic | Subordinate promissory note
Business Acquisition [Line Items]
Warranty liability assumed	$ 2,000
Minimum | 3M's Drive-Thru Communications Systems
Business Acquisition [Line Items]
Estimated useful lives		5 years
Minimum | Restaurant Magic
Business Acquisition [Line Items]
Estimated useful lives	5 years
Maximum | 3M's Drive-Thru Communications Systems
Business Acquisition [Line Items]
Estimated useful lives		7 years
Maximum | Restaurant Magic
Business Acquisition [Line Items]
Estimated useful lives	7 years
Cash Or Subordinated Promissory Notes | Restaurant Magic
Business Acquisition [Line Items]
Earn outs payable	50.00%
Restricted Shares Of Common Stock | Restaurant Magic
Business Acquisition [Line Items]
Earn outs payable	50.00%