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Basis of Presentation and Summary of Significant Accounting Policies Contract Balances (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Accounts Receivable    
Accounts receivable - contracts with customers $ 7,001,000 $ 5,454,000
Accounts receivable - non-ASC 606 2,817,000 3,649,000
Total Accounts Receivable 9,818,000 9,103,000
Less:Allowance for doubtful accounts (443,000) (569,000)
Total Accounts Receivable, net 9,375,000 8,534,000
Deferred income 487,000 185,000
Revenue recognized $ 0 $ 1,900,000