LICENSE AGREEMENTS AND COMMITMENTS - Lease costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Leases
Total operating lease costs	$ 701	$ 646	$ 1,406	$ 1,291
Cash paid for amounts included in the measurement of lease liabilities	601	549	1,208	1,093
Research and development expense
Leases
Total operating lease costs	641	587	1,279	1,174
Selling, general, and administrative expense
Leases
Total operating lease costs	$ 60	$ 59	$ 127	$ 117