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STOCKHOLDERS' EQUITY - Narrative (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock under public offering, net of issuance costs (in shares)				12,650,000
Proceeds from exercise of stock options and restricted stock units		$ 136,300			$ 1,187	$ 0
Biogen MA, Inc. | Stock Purchase Agreement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sale of stock, price per share (in dollars per share)	$ 9.2137
Consideration received on transaction	$ 225,000
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock under public offering, net of issuance costs (in shares)		12,700,000	24,420,157		24,420,157	12,650,000
Public offering price of common stock issued (in dollars per share)		$ 11.50

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