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Identifiable Intangible Assets and Goodwill - Additional Information (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 USD ($) segment | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 18, 2019 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Research and development | $ 4,865,000 | $ 3,060,000 |  |
Capitalized software development costs | 1,800,000 | 1,000,000 |  |
Amortization of capitalized software development costs | 1,600,000 | 500,000 |  |
Amortization of identifiable intangible assets | $ 210,000 | 0 |  |
Number of operating segments | segment | 2 |  |  |
Goodwill | $ 41,386,000 |  | $ 41,386,000 |
Goodwill impairment charge | 0 | 0 |  |
Restaurant/Retail And Government Reporting Segments |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Goodwill | 41,400,000 |  | 41,400,000 |
Brink Acquisition |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization of identifiable intangible assets | 200,000 | $ 200,000 |  |
3M's Drive-Thru Communications Systems |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization of identifiable intangible assets | 200,000 |  |  |
Restaurant Magic |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization of identifiable intangible assets | $ 600,000 |  |  |
Goodwill |  |  |  | $ 27,945,000
Minimum |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Useful life | 3 years |  |  |
Minimum | Internal use software |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Useful life | 3 years |  |  |
Maximum |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Useful life | 5 years |  |  |
Maximum | Internal use software |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Useful life | 5 years |  |  |
Internally developed software costs not meeting general release threshold |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Research and development | $ 4,400,000 |  | $ 2,500,000 |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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