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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Disaggregation of Revenue [Line Items]          
Net revenues $ 70,822,000 $ 77,870,000 $ 144,919,000 $ 136,172,000  
Contract assets 0   0   $ 0
United States          
Disaggregation of Revenue [Line Items]          
Net revenues 61,670,000 66,317,000 125,743,000 115,467,000  
All other countries          
Disaggregation of Revenue [Line Items]          
Net revenues 9,152,000 11,553,000 19,176,000 20,705,000  
Over time          
Disaggregation of Revenue [Line Items]          
Net revenues 69,746,000 77,453,000 142,972,000 135,621,000  
Point in time          
Disaggregation of Revenue [Line Items]          
Net revenues $ 1,076,000 $ 417,000 $ 1,947,000 $ 551,000