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Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Intangible Assets
The following is a summary of the Company’s intangible assets as of December 31, 2020:
  December 31, 2020
(in thousands)Estimated
Useful Life
Gross
Carrying
Amount
Accumulated
Amortization
Net
Carrying
Amount
HETLIOZ®
July 2035$33,000 $11,441 $21,559 
The following is a summary of the Company’s intangible assets as of December 31, 2019:
  December 31, 2019
(in thousands)Estimated
Useful Life
Gross
Carrying
Amount
Accumulated
Amortization
Net
Carrying
Amount
HETLIOZ®
July 2035$33,000 $9,963 $23,037 
Summary of Amortization Expense Amortization expense for the years ended December 31, 2020, 2019 and 2018 was as follows:
 Year Ended December 31,
(in thousands)202020192018
HETLIOZ®
$1,478 $1,505 $1,527 
Summary of Future Intangible Asset Amortization
The following is a summary of the future intangible asset amortization schedule as of December 31, 2020:
(in thousands)Total20212022202320242025Thereafter
HETLIOZ®
$21,559 $1,478 $1,478 $1,478 $1,478 $1,478 $14,169