SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES- Revenue Reclassification (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Out of period adjustment
Total revenues	$ 25,472	$ 34,565	$ 77,686	$ 76,099
Other revenue
Out of period adjustment
Total revenues	(941)	602	(976)	1,709
Product sales, net
Out of period adjustment
Total revenues	$ 25,997	33,664	$ 77,271	61,974
Revision of Prior Period, Reclassification, Adjustment | Other revenue
Out of period adjustment
Total revenues		(600)		(1,700)
Revision of Prior Period, Reclassification, Adjustment | Product sales, net
Out of period adjustment
Total revenues		$ 600		$ 1,700