STOCKHOLDERS' EQUITY - JonesTrading Agreements (Details) - USD ($) $ in Thousands		9 Months Ended
	Aug. 14, 2020	Sep. 30, 2020	Sep. 30, 2021
Class of Stock [Line Items]
Noncash Or Part Noncash Acquisition, Proceeds From Sale Of Common Stock Included In Accounts Receivable		$ 2,800
Sale of Stock, Number of Shares Issued in Transaction	2,415,000
Common Stock, Aggregate Offering Price			$ 150,000
At-The-Market Agreement [Member] | JonesTrading Institutional Services LLC [Member]
Class of Stock [Line Items]
Sale of Stock, Number of Shares Issued in Transaction		415,904