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Intangible Assets, Net
 6 Months Ended
Jun. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets, Net Intangible Assets, Net
The Company’s intangible assets consisted of the following (in thousands):
June 30, 2022December 31, 2021
Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
Amortizable intangible assets:
Patents$3,083 $(304)$2,780 $2,469 $(234)$2,235 
License agreements1,101 (916)185 1,101 (852)249 
Total amortizable intangible assets4,184 (1,219)2,965 3,570 (1,086)2,484 
Unamortized intangible assets
Trademarks380 — 380 375 — 375 
Total intangible assets$4,565 $(1,219)$3,346 $3,945 $(1,086)$2,859 
Amortization expense consisted of the following (in thousands):
Three Months Ended June, 30Six Months Ended June 30,
2022202120222021
Amortization expense$63 $49 $132 $96 
Expected future amortization of intangible assets as of June 30, 2022, is as follows (in thousands):
Year Ending December 31,Expected Amortization Expense
2022 (excluding the six months ended June 30, 2022)$131 
2023229 
2024160 
2025159 
2026158 
Thereafter2,128 
Total amortized intangible assets$2,965 

License Agreements
The Company has License Agreements with the University of Florida Research Foundation and the University of Texas at Austin in which certain royalty payments are paid quarterly.
Royalty expense consisted of the following (in thousands):
Three Months Ended June, 30Six Months Ended June 30,
2022202120222021
Royalty expense$766 $709 $1,439 $1,350 
Royalty fees are included in sales and marketing expense on the condensed consolidated statements of operations.