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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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