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Intangible Assets, Net (Tables)
3 Months Ended
Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets
Intangible assets consist of the following:
March 31, 2024December 31, 2023
(in thousands)Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
Amortizable intangible assets:
Patents$5,204 $(881)$4,323 $4,905 $(820)$4,085 
License agreements1,101 (1,089)12 1,101 (1,087)14 
Total amortizable intangible assets6,305 (1,969)4,335 6,006 (1,907)4,099 
Unamortized intangible assets:
Trademarks433 — 433 432 — 432 
Total intangible assets$6,737 $(1,969)$4,768 $6,438 $(1,907)$4,531 
Schedule of Indefinite-Lived Intangible Assets
Intangible assets consist of the following:
March 31, 2024December 31, 2023
(in thousands)Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
Amortizable intangible assets:
Patents$5,204 $(881)$4,323 $4,905 $(820)$4,085 
License agreements1,101 (1,089)12 1,101 (1,087)14 
Total amortizable intangible assets6,305 (1,969)4,335 6,006 (1,907)4,099 
Unamortized intangible assets:
Trademarks433 — 433 432 — 432 
Total intangible assets$6,737 $(1,969)$4,768 $6,438 $(1,907)$4,531 
Schedule of Amortization Expense
Amortization expense is as follows:
Three Months Ended March 31,
(in thousands)20242023
Amortization expense$62 $71 
Schedule of Future Amortization
As of March 31, 2024, future amortization of patents and license agreements is as follows:
Year Ending December 31,(in thousands)
2024 (excluding the three months ended March 31, 2024)$189 
2025252 
2026250 
2027247 
2028247 
Thereafter3,150 
Total$4,335 
Schedule of Royalty Expenses
Royalty fee expense included in sales and marketing expense is as follows:
Three Months Ended March 31,
(in thousands)20242023
Royalty fee expense (1)
$— $831 
(1) Royalty fees are no longer being paid due to the expiration of the patents in 2023.