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Identifiable Intangible Assets and Goodwill - Additional Information (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
segment
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Finite-Lived Intangible Assets [Line Items]          
Research and development $ 2,725,000 $ 3,222,000 $ 5,785,000 $ 6,090,000  
Capitalized software development costs 600,000 900,000 1,600,000 1,700,000  
Amortization of capitalized software development costs 700,000 1,100,000 1,500,000 2,100,000  
Amortization of identifiable intangible assets 242,000 242,000 $ 483,000 483,000  
Number of operating segments | segment     2    
Goodwill 11,051,000   $ 11,051,000   $ 11,051,000
Goodwill impairment charge     0   0
SureCheck | Held for sale          
Finite-Lived Intangible Assets [Line Items]          
Software costs reclassified to assets held for sale 2,900,000   2,900,000    
Restaurant/Retail          
Finite-Lived Intangible Assets [Line Items]          
Goodwill 10,300,000   10,300,000   10,300,000
Government          
Finite-Lived Intangible Assets [Line Items]          
Goodwill 800,000   800,000   800,000
Brink Acquisition          
Finite-Lived Intangible Assets [Line Items]          
Amortization of identifiable intangible assets $ 200,000 $ 200,000 $ 500,000 $ 500,000  
Minimum          
Finite-Lived Intangible Assets [Line Items]          
Useful life     3 years    
Maximum          
Finite-Lived Intangible Assets [Line Items]          
Useful life     5 years    
Acquired and internally developed software costs | Minimum          
Finite-Lived Intangible Assets [Line Items]          
Useful life     3 years    
Acquired and internally developed software costs | Maximum          
Finite-Lived Intangible Assets [Line Items]          
Useful life     5 years    
Internal use software | Minimum          
Finite-Lived Intangible Assets [Line Items]          
Useful life     3 years    
Internal use software | Maximum          
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     $ 3,100,000   $ 3,000,000