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Income Taxes - Reconciliation Income Taxes (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Tax at U.S. statutory rate	(21.00%)	(34.00%)
State taxes, net of federal benefit	(4.25%)	(3.45%)
Non-deductible items	0.44%	1.73%
Change in valuation allowance	10.25%	12.97%
True-up adjustment	(0.17%)	7.10%
Foreign operations	(0.28%)	0.66%
Change in tax rates	(0.00%)	19.40%
AMT adjustment	0.06%	(0.00%)
Effective income tax rate	(14.95%)	4.41%

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