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Acquisitions - Manatee Works Inc. Narrative (Details) - USD ($)
 12 Months Ended
Aug. 21, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]        
Revaluation of contingent consideration   $ (28,000) $ (463,000) $ (790,000)
Payment of contingent consideration   1,926,000 337,000 0
Manatee Works, Inc. [Member]        
Business Acquisition [Line Items]        
Purchase price $ 4,813,000      
Cash paid in purchase price 1,023,000      
Contingent consideration liability $ 3,790,000 1,350,000 2,200,000 3,000,000
Contingent consideration, low range   0    
Contingent consideration, high range   2,200,000    
Revaluation of contingent consideration   325,000 463,000 $ 790,000
Payment of contingent consideration   $ 525,000 $ 337,000  
Intangible assets, useful life 5 years      
Tax deductible goodwill $ 366,000