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LOANS PAYABLE (Details) € in Millions |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2020 USD ($) | Dec. 31, 2019 EUR (€) | Dec. 31, 2018 EUR (€) | Dec. 31, 2017 EUR (€) | Jan. 31, 2017 EUR (€) | Aug. 31, 2015 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2018 USD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2020 | Dec. 31, 2019 USD ($) | Aug. 23, 2019 USD ($) | May 31, 2018 USD ($) | Apr. 30, 2018 GBP (£) | Nov. 30, 2015 USD ($)
Loans Payable | 1.50% Loans Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.50%
Repayments of Debt | € |  | € 2.9 | € 2.9 | € 2.9 | € 2.9 |  |  |  |  |  |  |  |  |  |  |  |
Loans Payable | Non Interest Bearing Unsecured Convertible Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans payable, face amount | $ 4,500,000 |  |  |  |  |  |  |  | $ 16,900,000 |  |  |  |  |  |  | £ 10,500,000 |
Interest and unused commitment fees paid |  |  |  |  |  |  |  |  | 288,000 | $ 327,000 | $ 325,000 |  |  |  |  |  |
Exchange period | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Payable | Two Point Eighty Eight Percent Loans Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans payable, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,800,000 |  |
Interest and unused commitment fees paid |  |  |  |  |  |  | $ 88,000 |  | 105,000 |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.88% |  |
Loans Payable | Two Point Seven Five Percent Loans Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans payable, face amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,000,000.0 |  |  |  |
Interest and unused commitment fees paid |  |  |  |  |  |  |  |  | 103,000 | $ 32,000 |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 2.75% |  |  |  |
Exchange period |  | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Payable | Former Shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party interest expense |  |  |  |  |  |  | $ 63,000 | $ 96,000 | $ 21,000 |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 1.49% | 2.94% | 3.92% |  |  |  |  |  |
Loans Payable | Joint Venture | 1.50% Loans Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party interest expense |  |  |  |  |  |  |  |  | $ 30,000 | $ 76,000 | $ 131,000 |  |  |  |  |  |
Revolving line of credit | Bank of America |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit, maximum borrowing capacity |  |  |  |  |  | $ 75,000,000.0 |  |  |  |  |  |  |  | $ 100,000,000.0 |  |  |
Principal outstanding |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Revolving line of credit | Bank of America | 2019 Line of Credit, Expansion Option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000.0 |  |  |
Other Liabilities | January 2017 Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, noncontingent consideration liability |  |  |  |  |  |  |  |  | $ 0 | $ 999,000 |  |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) | Revolving line of credit | Bank of America |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate on line of credit |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |
ITALY | Leonardo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans payable, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,000,000
Interest acquired in the investment banking operations of Leonardo in Italy (as a percent) |  |  |  |  |  |  |  |  | 51.00% |  |  | 51.00% |  |  |  |  | 49.00%

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