QUARTERLY DATA (unaudited) - Revenue and Net income (loss) (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | 12 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Sep. 30, 2021 |
Dec. 31, 2020 |
Sep. 30, 2020 |
Jun. 30, 2020 |
Mar. 31, 2020 |
Dec. 31, 2019 |
Sep. 30, 2019 |
Jun. 30, 2019 |
Mar. 31, 2019 |
Sep. 30, 2021 |
Sep. 30, 2020 |
Dec. 31, 2020 |
Dec. 31, 2019 |
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| QUARTERLY DATA (unaudited) | |||||||||||||
| Revenue, net of accounts receivable valuation allowance | $ 8,546 | $ 5,964 | $ 3,963 | $ (10,736) | $ 4,333 | $ (4,659) | $ 7,951 | $ 8,389 | $ 6,044 | $ 19,533 | $ (2,440) | $ 3,524 | $ 17,725 |
| Net income/(loss) before tax | $ 249 | $ (114) | $ (1,344) | $ (15,284) | $ (479) | $ (8,942) | $ 4,763 | $ 5,324 | $ 2,377 | $ (3,190) | $ (17,107) | $ (17,221) | $ 3,522 |
| X | ||||||||||
- Definition Amount, excluding tax collected from customer, of revenue (revenue adjustments) from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. No definition available.
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| X | ||||||||||
- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- References No definition available.
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