Quarterly report pursuant to Section 13 or 15(d)

REVENUE FROM CONTRACTS WITH CUSTOMERS (Details)

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REVENUE FROM CONTRACTS WITH CUSTOMERS (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Disaggregation of Revenue [Line Items]          
Net revenues $ 70,571,000 $ 69,711,000 $ 215,490,000 $ 205,883,000  
Contract assets 0   0   $ 0
United States          
Disaggregation of Revenue [Line Items]          
Net revenues 61,670,000 58,563,000 187,319,000 173,990,000  
All other countries          
Disaggregation of Revenue [Line Items]          
Net revenues 8,901,000 11,148,000 28,171,000 31,893,000  
Over time          
Disaggregation of Revenue [Line Items]          
Net revenues 69,255,000 69,284,000 212,226,000 204,905,000  
Point in time          
Disaggregation of Revenue [Line Items]          
Net revenues $ 1,316,000 $ 427,000 $ 3,264,000 $ 978,000