Quarterly report pursuant to Section 13 or 15(d)

The gross carrying amounts and accumulated amortization related to acquired intangible assets as of September, 2021 and December 31, 2020 were as follows (Details)

v3.21.2
The gross carrying amounts and accumulated amortization related to acquired intangible assets as of September, 2021 and December 31, 2020 were as follows (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Patents, Gross $ 1,444,000 $ 1,578,000
Patents [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 7,934,000 7,848,000
Finite-Lived Intangible Assets, Accumulated Amortization (6,490,000) (6,270,000)
Finite-Lived Patents, Gross $ 1,444,000 $ 1,578,000