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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% |  |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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