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Revenue Recognition - Schedule of Disaggregated Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 54,732 | $ 44,682
Billed | Restaurant/Retail |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 28,838 | 23,513
Billed | Restaurant/Retail | Restaurant/Retail |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 28,838 | 23,023
Billed | Restaurant/Retail | Grocery |  |
Disaggregation of Revenue [Line Items] |  |
Revenue |  | 490
Billed | Restaurant/Retail | Mission Systems |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 0 | 0
Billed | Restaurant/Retail | ISR Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 0 | 0
Advanced billings | Restaurant/Retail |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 8,571 | 6,047
Advanced billings | Restaurant/Retail | Restaurant/Retail |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 8,571 | 5,103
Advanced billings | Restaurant/Retail | Grocery |  |
Disaggregation of Revenue [Line Items] |  |
Revenue |  | 944
Advanced billings | Restaurant/Retail | Mission Systems |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 0 | 0
Advanced billings | Restaurant/Retail | ISR Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 0 | 0
Advanced billings | Government |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 17,323 | 15,122
Advanced billings | Government | Restaurant/Retail |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 0 | 0
Advanced billings | Government | Grocery |  |
Disaggregation of Revenue [Line Items] |  |
Revenue |  | 0
Advanced billings | Government | Mission Systems |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 8,448 | 8,546
Advanced billings | Government | ISR Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 8,875 | $ 6,576

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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