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Intangible Assets - (HETLIOZ) - Additional Information (Detail) - HETLIOZ® - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 194 Months Ended
--- | --- | --- | ---
Apr. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2020
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Acquisition of intangible assets |  | $ 25.0 |  | $ 8.0 | $ 37.5
Cumulative worldwide sales milestone | $ 250.0 |  |  |  |
Intangible assets capitalized |  |  | $ 25.0 |  | $ 33.0

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- 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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- 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 + Details
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- Definition Net cumulative worldwide sales to achieve milestone and trigger payment of milestone obligation. + References No definition available. + Details
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