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Summary of Significant Accounting Policies - Narrative (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) reporting_unit segment shares | Dec. 31, 2016 USD ($) shares
Property, Plant and Equipment [Line Items] |  |
Number of segments | segment | 2 |
Change in fair value of contingent consideration liability | $ (1,000,000) |
Deferred compensation liability | 3,900,000 | $ 3,800,000
Contingent consideration liability | 3,000,000 | 4,000,000
Net rental loss on rental contracts | (683,000) | (662,000)
Amortization of capitalized software costs | 2,700,000 | 1,100,000
Insurance recovery (loss) on investment | 0 | 771,000
Capitalized software costs | 3,800,000 | 2,700,000
Impairment of intangible assets | $ 0 | 500,000
Number of operating segments | segment | 2 |
Number of reportable units | reporting_unit | 2 |
Amount outstanding for goodwill within continuing operations | $ 11,051,000 | 11,051,000
Impairment of goodwill | 0 | 0
Intangible assets impairment charge |  | 500,000
Adoption of accounting standard on deferred taxes | $ 578,000 | $ (578,000)
Employee Stock Option |  |
Property, Plant and Equipment [Line Items] |  |
Incremental shares excluded from computation of diluted earnings per share (in shares) | shares | 265,000 | 38,000
Restricted Stock |  |
Property, Plant and Equipment [Line Items] |  |
Incremental shares excluded from computation of diluted earnings per share (in shares) | shares | 0 | 0
Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated useful lives | 3 years |
Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated useful lives | 25 years |
Brink Software |  |
Property, Plant and Equipment [Line Items] |  |
Change in fair value of contingent consideration liability | $ (1,000,000) | $ (1,100,000)
Retained Earnings |  |
Property, Plant and Equipment [Line Items] |  |
Adoption of accounting standard on deferred taxes |  | (578,000)
Retained Earnings | Accounting Standards Update 2016-09 |  |
Property, Plant and Equipment [Line Items] |  |
Adoption of accounting standard on deferred taxes |  | $ 578,000
Income approach valuation technique |  |
Property, Plant and Equipment [Line Items] |  |
Weighting of valuation method | 80.00% |
Long-term growth rate | 3.00% |
Income approach valuation technique | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Discount rate | 14.50% |
Income approach valuation technique | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Discount rate | 27.00% |
Market approach valuation technique, public company method |  |
Property, Plant and Equipment [Line Items] |  |
Weighting of valuation method | 10.00% |
Market approach valuation technique, quoted market price method |  |
Property, Plant and Equipment [Line Items] |  |
Weighting of valuation method | 10.00% |
Software and Software Development Costs | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Useful life of intangibles | 3 years |
Software and Software Development Costs | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Useful life of intangibles | 7 years |

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