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Intangible Assets, Net (Tables)
 9 Months Ended
Sep. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of intangible assets
The Company’s intangible assets consisted of the following (in thousands):
September 30, 2022December 31, 2021
Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
Amortizable intangible assets:
Patents$3,245 $(342)$2,903 $2,469 $(234)$2,235 
License agreements1,101 (943)158 1,101 (852)249 
Total amortizable intangible assets4,346 (1,285)3,061 3,570 (1,086)2,484 
Unamortized intangible assets
Trademarks387 — 387 375 — 375 
Total intangible assets$4,733 $(1,285)$3,448 $3,945 $(1,086)$2,859 
Schedule of future amortization
Amortization expense consisted of the following (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2022202120222021
Amortization expense$66 $52 $198 $148 
Expected future amortization of intangible assets as of September 30, 2022, is as follows (in thousands):
Year Ending December 31,Expected Amortization Expense
2022 (excluding the nine months ended September 30, 2022)$68 
2023237 
2024169 
2025169 
2026167 
Thereafter2,251 
Total amortized intangible assets$3,061 
Schedule of royalty expenses
Royalty expense consisted of the following (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2022202120222021
Royalty expense$848 $687 $2,287 $2,037