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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 282,876 | $ 213,786 | $ 187,232
Service |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 105,337 | 69,284 | 56,978
Product |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 105,014 | 73,228 | 66,329
Restaurant/Retail | Point in Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 123,180 | 89,220 | 93,857
Restaurant/Retail | Over Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 87,171 | 53,292 | 29,450
Restaurant/Retail | Hardware | Point in Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 102,066 | 72,029 | 63,811
Restaurant/Retail | Hardware | Over Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 0 | 0 | 0
Restaurant/Retail | Software | Point in Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 1,131 | 668 | 3,143
Restaurant/Retail | Software | Over Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 56,723 | 25,716 | 13,677
Restaurant/Retail | Service | Point in Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 19,983 | 16,523 | 26,903
Restaurant/Retail | Service | Over Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 30,448 | 27,576 | 15,773
Restaurant/Retail | Mission systems | Point in Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 0 | 0 | 0
Restaurant/Retail | Mission systems | Over Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 0 | 0 | 0
Restaurant/Retail | Intelligence, surveillance, and reconnaissance solutions | Point in Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 0 | 0 | 0
Restaurant/Retail | Intelligence, surveillance, and reconnaissance solutions | Over Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 0 | 0 | 0
Restaurant/Retail | Product | Point in Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 0 | 0 | 0
Restaurant/Retail | Product | Over Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 0 | 0 | 0
Restaurant/Retail | Hardware, Software, and Service |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue |  | 142,500 | 123,300
Government | Over Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 72,525 | 71,274 | 63,925
Government | Hardware | Over Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 0 | 0 | 0
Government | Software | Over Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 0 | 0 | 0
Government | Service | Over Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 0 | 0 | 0
Government | Mission systems | Over Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 38,311 | 37,448 | 29,541
Government | Intelligence, surveillance, and reconnaissance solutions | Over Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 33,188 | 32,947 | 33,513
Government | Product | Over Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 1,026 | $ 879 | $ 871

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