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Business Description, Basis of Presentation and Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	12 Months Ended		60 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2018
Business Description, Basis of Presentation and Significant Accounting Policies
Current inventory	$ 10,463	$ 11,441	$ 10,463
Long-term inventory	4,590	6,284	4,590
Operating lease right-of-use assets	1,936	2,459	1,936
Operating lease liability, net of current	1,489	2,021	1,489
Decreased revenue due to the impact of the adoption of the New Revenue Standard	29,069	25,042
Advertising expenses	440	902
Net deferred tax assets	0		0
Working capital	22,185	18,934	22,185
Net cash used in operating activities	982	4,656
Decrease of cash used in operating activities		3,674
Litigation for Intellectual Property Infringement
Business Description, Basis of Presentation and Significant Accounting Policies
Litigation Settlement, Expense			20,319
Equipment Sales
Business Description, Basis of Presentation and Significant Accounting Policies
Decreased revenue due to the impact of the adoption of the New Revenue Standard	28,698
Software and Licenses
Business Description, Basis of Presentation and Significant Accounting Policies
Decreased revenue due to the impact of the adoption of the New Revenue Standard	$ 371
Accounting Standards Update 2016-02
Business Description, Basis of Presentation and Significant Accounting Policies
Operating lease right-of-use assets				$ 2,966
Operating lease liability, net of current				3,101
Deferred rent				$ 135
Minimum
Business Description, Basis of Presentation and Significant Accounting Policies
Intangible assets, estimated useful lives	3 years
Maximum
Business Description, Basis of Presentation and Significant Accounting Policies
Intangible assets, estimated useful lives	10 years
Replacement Parts
Business Description, Basis of Presentation and Significant Accounting Policies
Current inventory	$ 35	$ 102	$ 35

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