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Goodwill and Intangible Assets, Net
 9 Months Ended
Sep. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets, Net Goodwill and Intangible Assets, Net
Goodwill
The following table summarizes the changes in the carrying amount of goodwill (dollars in thousands):
Balance as of December 31, 2021
$117,516 
Measurement period adjustments related to the acquisition of Adamas (see Note 3)(133)
Balance as of September 30, 2022 (unaudited)
$117,383 
Intangible Assets, Net
The following table sets forth the gross carrying amounts and related accumulated amortization of intangibles assets and goodwill (dollars in thousands):
September 30, 2022December 31, 2021
(unaudited)
Remaining Weighted
Average Life (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 rights8.02681,100 (93,642)587,458 681,100 (35,550)645,550 
Capitalized patent defense costs4.2443,820 (32,517)11,303 43,820 (28,677)15,143 
Total intangible assets7.95$848,920 $(126,159)$722,761 $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 Oxtellar XR and Trokendi 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, or earlier under certain circumstances.
Amortization expense for intangible assets was approximately $20.6 million and $61.9 million for the three and nine months ended September 30, 2022, respectively, and approximately $6.0 million and $18.0 million for the three and nine months ended September 30, 2021, respectively. The increase in expense is primarily due to amortization of the acquired developed technology and product rights from the Adamas Acquisition.
Anticipated annual amortization expense for intangible assets is estimated at $79.8 million each in both 2023 and 2024, $75.1 million in 2025, $74.9 million in 2026, and $73.2 million in 2027.