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Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Finite-Lived Intangible Assets [Line Items] |  |
Net Carrying Amount | $ 21,559 | $ 23,037
HETLIOZ® |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 33,000 | 33,000
Accumulated Amortization | 11,441 | 9,963
Net Carrying Amount | $ 21,559 | $ 23,037

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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