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Subsequent Events - Additional Information (Detail) - USD ($)		12 Months Ended
	Mar. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Subsequent Event [Line Items]
Common stock, par value		$ 0.001	$ 0.001
Proceeds from issuance of common stock		$ 9,000,000	$ 9,676,000
Subsequent Event [Member] | Open Market Sale Agreement [Member] | Jefferies LLC [Member]
Subsequent Event [Line Items]
Common stock, par value	$ 0.001
Percentage of gross proceeds of shares of common stock	3.00%
Subsequent Event [Member] | Open Market Sale Agreement [Member] | Jefferies LLC [Member] | Maximum [Member]
Subsequent Event [Line Items]
Proceeds from issuance of common stock	$ 75,000,000

X

- Definition

Percentage of gross proceeds of shares of common stock.

+ References

No definition available.

+ Details

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Namespace Prefix:	nvus_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Face amount or stated value per share of common stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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Balance Type:	na
Period Type:	instant

X

- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

+ Details

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Period Type:	duration

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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X

- Details

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X

- Details

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X

- Details

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- Details

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