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SUBSEQUENT EVENTS - Additional Information (Detail) - Biogen MA, Inc. - USD ($) $ in Millions	1 Months Ended
	Apr. 30, 2020	Apr. 30, 2020	Feb. 29, 2020
Collaboration And License Agreement
Subsequent Event [Line Items]
Proceeds from collaborators			$ 125.0
Subsequent Event | Stock Purchase Agreement
Subsequent Event [Line Items]
Consideration received on transaction	$ 225.0	$ 225.0
Number of shares issued in transaction (in shares)	24,420,157
Subsequent Event | Collaboration And License Agreement
Subsequent Event [Line Items]
Proceeds from collaborators		$ 125.0

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585

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