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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) segment | Dec. 31, 2020 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Number of reportable segments | segment |  |  | 2 |
Contract with customer, liability, revenue recognized |  | $ 800 |  |
Remaining performance obligation |  | 772 | $ 772 |
Proceeds from sale of debt securities |  |  |  | $ 118,500
Restricted cash, released | $ 35,000 |  |  |
Advertising expense |  | $ 52 |  |
Vesting period |  |  | 1 year |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01 |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Remaining performance obligation period |  | 2 years | 2 years |
Merton | Senior Secured Notes | Securities Purchase Agreement |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Lender fees |  |  |  | $ 4,600
Printronix |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Allowance for doubtful accounts and sales returns |  | $ 78 | $ 78 |
Estimated useful life |  |  | 7 years |
Minimum |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Warranty term |  |  | 3 months |
Vesting period |  |  | 1 year |
Minimum | Patents |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Estimated useful life |  |  | 5 years |
Maximum |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Warranty term |  |  | 2 years |
Vesting period |  |  | 3 years |
Maximum | Patents |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Estimated useful life |  |  | 10 years |

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