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Significant Accounting Policies (Narrative) (Details)	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jan. 01, 2019 USD ($)
Segment Reporting [Abstract]
Number of operating segments | segment									1
Net revenues from customers outside the United States	$ 13,497,906	$ 8,492,530	$ 10,163,724	$ 8,587,605	$ 11,649,288	$ 11,196,961	$ 8,667,127	$ 9,636,755	$ 40,741,765	$ 41,150,131	$ 33,025,560
Distribution costs									618,756	621,142	703,353
Advertising costs									2,219,074	2,589,185	2,626,238
Accounting Standards Update 2016-02 | Scenario, Forecast | Subsequent Event | Minimum
Segment Reporting [Abstract]
ROU asset												$ 3,600,000
Lease liabilities												3,600,000
Accounting Standards Update 2016-02 | Scenario, Forecast | Subsequent Event | Maximum
Segment Reporting [Abstract]
ROU asset												4,200,000
Lease liabilities												$ 4,200,000
Non-US
Segment Reporting [Abstract]
Net revenues from customers outside the United States									$ 2,100,000	$ 1,600,000	$ 2,000,000.0

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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