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Schedule II (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 0 $ 0 $ 32,000
(Recovered)/Charged to Costs and Expenses 25,000 0 (23,000)
Charged to Other Accounts 0 0 0
Deductions [1] 0 0 9,000
Balance at End of Year 25,000 0 0
Allowance for Chargebacks [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 857,000 309,000 523,000
(Recovered)/Charged to Costs and Expenses 2,639,000 981,000 444,000
Charged to Other Accounts 0 0 0
Deductions [1] 1,152,000 433,000 658,000
Balance at End of Year $ 2,344,000 $ 857,000 $ 309,000
[1] (A) Amount represents uncollectible accounts written off.