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Schedule II (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance for Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 0 $ 32,000 $ 289,000
(Recovered)/Charged to Costs and Expenses 0 (23,000) (167,000)
Charged to Other Accounts 0 0 0
Deductions [1] 0 9,000 90,000
Balance at End of Year 0 0 32,000
Allowance for Chargebacks [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 309,000 523,000 813,000
(Recovered)/Charged to Costs and Expenses 981,000 444,000 473,000
Charged to Other Accounts 0 0 0
Deductions [1] 433,000 658,000 763,000
Balance at End of Year $ 857,000 $ 309,000 $ 523,000
[1] (A) Amount represents uncollectible accounts written off.