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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 |

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