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14. ACQUISITION (Details) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 23, 2015 USD ($) patent | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($)
Acquisition disclosure |  |  |  |  |  |  |
Discount rate | 0.148 |  |  |  | 0.145 |  |
Maximum |  |  |  |  |  |  |
Acquisition disclosure |  |  |  |  |  |  |
Discount rate |  |  |  |  | 0.15 |  |
Other accrued expenses |  |  |  |  |  |  |
Acquisition disclosure |  |  |  |  |  |  |
Contingent consideration liability |  |  |  |  | $ 4,200,000 | $ 3,900,000 |
MikaMonu |  |  |  |  |  |  |
Acquisition disclosure |  |  |  |  |  |  |
Cash paid for acquisition | $ 4,900,000 |  |  |  |  |  |
Payment of escrow deposit |  | $ 1,000,000 | $ 750,000 | $ 743,000 |  |  |
Potential cash retention payments | 2,500,000 |  |  |  |  |  |
Change in contingent consideration liability |  |  |  |  | 229,000 | 80,000 | $ (326,000)
MikaMonu | Other accrued expenses |  |  |  |  |  |  |
Acquisition disclosure |  |  |  |  |  |  |
Contingent consideration liability | $ 5,800,000 |  |  |  | 4,200,000 | $ 3,900,000 |
MikaMonu | United States |  |  |  |  |  |  |
Acquisition disclosure |  |  |  |  |  |  |
Number of patents held | patent | 12 |  |  |  |  |  |
MikaMonu | Continued employment of Dr. Avidan Akerib |  |  |  |  |  |  |
Acquisition disclosure |  |  |  |  |  |  |
Amount of payment held in escrow | $ 2,500,000 |  |  |  |  |  |
Contingent consideration | 1,200,000 |  |  |  |  |  |
MikaMonu | Product development milestones and revenue targets |  |  |  |  |  |  |
Acquisition disclosure |  |  |  |  |  |  |
Contingent consideration |  |  |  |  | 1,300,000 |  |
MikaMonu | Product development milestones and revenue targets | Maximum |  |  |  |  |  |  |
Acquisition disclosure |  |  |  |  |  |  |
Contingent consideration |  |  |  |  | 36,000,000 |  |
MikaMonu | Product development milestones and revenue targets | Accrued expenses and other liabilities |  |  |  |  |  |  |
Acquisition disclosure |  |  |  |  |  |  |
Contingent consideration |  |  |  |  | $ 750,000 |  |
MikaMonu | Revenue milestones to be achieved by January, 1 2022 |  |  |  |  |  |  |
Acquisition disclosure |  |  |  |  |  |  |
Contingent consideration | 4,000,000 |  |  |  |  |  |
MikaMonu | Quarterly payments based on net revenue | Maximum |  |  |  |  |  |  |
Acquisition disclosure |  |  |  |  |  |  |
Contingent consideration | $ 30,000,000 |  |  |  |  |  |
Contingent consideration, percent of net revenue | 5.00% |  |  |  |  |  |

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