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Accrued Sales Taxes and Regulatory Fees	12 Months Ended
Accrued Sales Taxes and Regulatory Fees	Dec. 31, 2017
Payables and Accruals [Abstract]
Accrued Sales Taxes and Regulatory Fees	Accrued Sales Taxes and Regulatory Fees Included in accrued sales taxes and regulatory fees are certain estimated sales and use taxes and regulatory fees and sales taxes and regulatory fees collected from customers that are to be remitted to taxing authorities. Actual payments may vary from our estimates. Accrued sales taxes and regulatory fees as of December 31, 2017 and 2016 were $259,000 and $395,000, respectively.