Intangible Assets - HETLIOZ - Additional Information (Detail) - HETLIOZ® - USD ($) $ in Millions |
1 Months Ended | 12 Months Ended | 227 Months Ended | |
|---|---|---|---|---|
Apr. 30, 2018 |
Jan. 31, 2014 |
Dec. 31, 2018 |
Dec. 31, 2022 |
|
| Finite-Lived Intangible Assets [Line Items] | ||||
| Acquisition of intangible assets | $ 8.0 | $ 25.0 | $ 37.5 | |
| Cumulative worldwide sales milestone | $ 250.0 | |||