Business Description, Basis of Presentation and Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	12 Months Ended		72 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2018
Business Description, Basis of Presentation and Significant Accounting Policies
Current inventory	$ 10,033	$ 10,463	$ 10,033
Long-term inventory	3,567	4,590	3,567
Operating lease right-of-use assets	1,537	1,936	1,537
Operating lease liability, net of current	1,026	1,489	1,026
Decreased revenue due to the impact of the adoption of the New Revenue Standard	28,967	29,069
Advertising expenses	508	440
Net deferred tax assets	0		0
Cash and cash equivalents	1,071	3,803	1,071
Working capital	17,969	22,185	17,969
Net cash used in operating activities	4,394	982
Decrease of cash used in operating activities	$ (3,412)
Litigation Settlement, Expense			28,156
Period of cumulative pre-tax operating losses	3 years
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	$ 28,792
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	$ 175
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
Property and equipment, useful life (in years)	2 years
Intangible assets, estimated useful lives	3 years
Maximum
Business Description, Basis of Presentation and Significant Accounting Policies
Property and equipment, useful life (in years)	10 years
Intangible assets, estimated useful lives	10 years
Maturity period of highly-liquid investments classified as cash equivalents	3 months
Period of payment requirement from date of invoicing for distributor payment	45 days
Period of scheduled delivery date to customer	1 year
Period of payment requirement from date of invoicing for dealer payment	30 days
Replacement Parts
Business Description, Basis of Presentation and Significant Accounting Policies
Current inventory	$ 130	$ 35	$ 130