Quarterly report pursuant to Section 13 or 15(d)

REVENUE - Accounts Receivable (Details)

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REVENUE - Accounts Receivable (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Accounts receivable, net:    
Total accounts receivable, net $ 20,989 $ 27,810
Technical services    
Accounts receivable, net:    
Total accounts receivable, net 11,278 18,904
Professional services    
Accounts receivable, net:    
Total accounts receivable, net 9,315 8,209
Other.    
Accounts receivable, net:    
Total accounts receivable, net $ 396 $ 697