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Commitments and Contingencies - (HETLIOZ) - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended				194 Months Ended
	Mar. 31, 2020	Jun. 30, 2018	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2020
HETLIOZ
Percentage of future sublicense fees payable to third-party	mid-twenties
HETLIOZ®
HETLIOZ
Acquisition of intangible assets		$ 25.0		$ 8.0	$ 37.5
Intangible assets capitalized			$ 25.0		$ 33.0
Royalty payment period	10 years
Royalty payable percentage on net sales	10.00%

X

- Definition

Amount of increase (decrease) in carrying value of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

No definition available.

+ Details

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X

- Definition

The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585

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X

- Definition

Hetlioz [Abstract]

+ References

No definition available.

+ Details

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X

- Definition

Percentage of sublicense fees payable to third party under a contractual arrangement for use of technology or intellectual property.

+ References

No definition available.

+ Details

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X

- Definition

Royalty payable percentage under a contractual arrangement for use of technology or intellectual property.

+ References

No definition available.

+ Details

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X

- Definition

Royalty Period

+ References

No definition available.

+ Details

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- Details

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