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LOANS PAYABLE (Details)
1 Months Ended 12 Months Ended
Dec. 31, 2019
EUR (€)
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
EUR (€)
Jan. 31, 2017
EUR (€)
Aug. 31, 2015
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
Nov. 30, 2019
EUR (€)
Aug. 23, 2019
USD ($)
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%
Portion of loan paid | € € 2,900,000 € 2,900,000 € 2,900,000 € 2,900,000                    
Loans Payable | Non Interest Bearing Unsecured Convertible Loan                            
Debt Instrument [Line Items]                            
Loans payable, face amount | £                         £ 10,500,000  
Interest and unused commitment fees paid           $ 327,000 $ 325,000              
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           105,000 88,000              
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           32,000                
Stated interest rate                 2.75%          
Loans Payable | Former Shareholders                            
Debt Instrument [Line Items]                            
Related party interest expense           $ 63,000 $ 96,000 $ 124,000            
Stated interest rate           2.94% 3.92% 3.10%            
Loans Payable | Joint Venture | 1.50% Loans Payable                            
Debt Instrument [Line Items]                            
Related party interest expense           $ 76,000 $ 131,000 $ 179,000            
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                
Interest and unused commitment fees paid           278,000 228,000 $ 228,000            
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      
Fidentiis Capital, S.A. | Loans Payable | Non Interest Bearing Unsecured Convertible Loan                            
Debt Instrument [Line Items]                            
Loans payable, face amount | €                   € 500,000        
Other Liabilities | January 2017 Acquisition                            
Debt Instrument [Line Items]                            
Business combination, noncontingent consideration liability           $ 999,000 $ 1,983,000              
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                           $ 14,000,000.0
Interest acquired in the investment banking operations of Leonardo in Italy (as a percent)           51.00%     51.00%         49.00%