FAIR VALUE MEASUREMENTS - EQUITY INVESTMENT (Details) - USD ($)		3 Months Ended
	Aug. 03, 2020	Mar. 31, 2021	Dec. 31, 2007
Summary of Investment Holdings [Line Items]
Number of shares owned	35,990,825	0	13,842,625
Business Combination Cost Of Acquired Entity Equity Interests Issued And Issuable Fair Value Method	we received 13 BARD1 shares for every five shares of Sienna ordinary shares, resulting in our ownership of 35,990,825 shares of BARD1.
Realized investment gains (losses)		$ 1,233,000
Maximum
Summary of Investment Holdings [Line Items]
Cost method investments ownership percentage			20.00%
Equity investment
Summary of Investment Holdings [Line Items]
Cost method investments cost basis			$ 0