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Acquisitions - Chiaro Technologies LLC (Details) - USD ($)
12 Months Ended
Dec. 09, 2016
Nov. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]          
Revaluation of contingent consideration     $ (3,000) $ (28,000) $ (463,000)
Chiaro Technologies LLC [Member]          
Business Acquisition [Line Items]          
Purchase price   $ 4,149,000      
Cash paid in purchase price   3,538,000      
Contingent consideration, noncurrent   611,000 908,000 626,000  
Contingent consideration, low range   0      
Contingent consideration, high range   1,250,000      
Revaluation of contingent consideration     $ 282,000 $ 15,000  
Tax deductible goodwill   $ 902,000      
Completed Technologies [Member] | Chiaro Technologies LLC [Member]          
Business Acquisition [Line Items]          
Intangible assets, useful life 7 years