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Acquisitions - Narrative (Details) - USD ($) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 18, 2019 | Sep. 30, 2019 | Jun. 30, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 41,214 |  |  | $ 41,214 |  | $ 41,386
Working capital for acquisitions |  |  | $ 200 |  | $ 200 |  | 191 | $ 0 |
Contingent consideration liability |  |  |  | 1,000 |  |  | 1,000 |  |
Adjustment to contingent consideration liability |  |  |  | 2,310 |  | $ 0 | 2,310 | 0 |
3M's Drive-Thru Communications Systems |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business acquisition, purchase price |  | $ 8,400 |  |  |  |  |  |  |
Fair value of assets acquired |  | 8,400 |  |  |  | 8,400 |  | 8,400 |
Goodwill |  | 2,400 |  |  |  | 2,400 |  | 2,400 |
Warranty liability assumed |  | 1,400 |  |  |  |  |  |  |
Business acquisition, cash paid |  | 7,000 |  |  |  |  |  |  |
Revenue of acquiree |  |  |  | 5,700 |  |  | 13,200 |  |
3M's Drive-Thru Communications Systems | Developed Technology |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Finite-lived intangible assets |  | 1,200 |  |  |  | 1,200 |  | 1,200 |
3M's Drive-Thru Communications Systems | Customer Relationships |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Finite-lived intangible assets |  | $ 3,600 |  |  |  | $ 3,600 |  | $ 3,600 |
Restaurant Magic |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Fair value of assets acquired | $ 47,517 |  |  |  |  |  |  |  |
Goodwill | 27,773 |  |  |  |  |  |  |  |
Business acquisition, cash paid | $ 12,800 |  |  |  |  |  |  |  |
Percent acquired | 100.00% |  |  |  |  |  |  |  |
Consideration | $ 42,833 |  |  |  |  |  |  |  |
Equity issued | $ 27,500 |  |  |  |  |  |  |  |
Contingent consideration liability |  |  |  | 1,000 |  |  | 1,000 |  | $ 3,300
Adjustment to contingent consideration liability |  |  |  | 2,300 |  |  |  |  |
Revenue of acquiree |  |  |  | $ 2,200 |  |  | $ 6,200 |  |
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 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |

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