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Goodwill and Intangible Assets, Net
12 Months Ended
Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets, Net Goodwill and Intangible Assets, Net
Goodwill
The following table sets forth the gross carrying amounts of goodwill as of December 31, 2022 (dollars in thousands):
Balance as of December 31, 2021
$117,516 
Measurement period adjustments related to the acquisition of Adamas (see Note 3)(497)
Balance as of December 31, 2022
$117,019 
Intangible Assets, Net
The following table sets forth the gross carrying amounts and related accumulated amortization of intangibles assets and goodwill (dollars in thousands):
December 31, 2022December 31, 2021
Remaining Weighted-
Average Amortization Period
(Years)
Carrying Amount, GrossAccumulated AmortizationCarrying Amount, NetCarrying Amount, GrossAccumulated AmortizationCarrying Amount, Net
Acquired in-process research and development$124,000 $— $124,000 $124,000 $— $124,000 
Intangible assets subject to amortization:
Acquired developed technology and product rights7.78681,500 (113,061)568,439 681,100 (35,550)645,550 
Capitalized patent defense costs4.2543,820 (33,796)10,024 43,820 (28,677)15,143 
Total intangible assets7.72$849,320 $(146,857)$702,463 $848,920 $(64,227)$784,693 

Patent defense costs are deferred legal fees incurred in conjunction with defending patents for Oxtellar XR and Trokendi XR. U.S. patents covering Trokendi XR and Oxtellar XR will expire no earlier than 2027. In regards to Trokendi XR, the Company entered into settlement agreements that allow third parties to enter the market by January 1, 2023.
Amortization expense for intangible assets was approximately $82.6 million, $30.0 million, and $15.7 million for the years ended December 31, 2022, 2021, and 2020, respectively.
The following table sets forth the anticipated annual amortization expense for definite-lived intangible assets. Actual amortization expense to be reported in future periods could differ from these estimates as a result of acquisitions, divestitures, and asset impairments, among other factors (dollars in thousands).
Year:Estimated Amortization Expense
2023$79,865 
202479,865 
202575,198 
202674,974 
202773,205 
Thereafter195,356