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Intangible Assets, net
 12 Months Ended
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets, net Intangible Assets, net
The Company’s definite-lived intangible assets as of December 31, 2021 and 2020 consisted of the following:
December 31, 2021
Customer
Relationships		Developed TechnologiesTrade NameInstalled User BaseTotal
Gross carrying amount$53,000 $34,500 $3,300 $1,400 $92,200 
Accumulated amortization(21,161)(28,331)(3,163)(506)(53,161)
Intangible assets, net$31,839 $6,169 $137 $894 $39,039 
December 31, 2020
Customer
Relationships		Developed TechnologiesTrade NameInstalled User BaseTotal
Gross carrying amount$53,000 $34,500 $3,300 $1,400 $92,200 
Accumulated amortization(17,528)(23,343)(3,088)(272)(44,231)
Intangible assets, net$35,472 $11,157 $212 $1,128 $47,969 
Amortization of definite-lived intangible assets is provided over their estimated useful lives on a straight-line basis or the pattern in which economic benefits are consumed, if reliably determinable. The Company reviews its definite-lived intangible assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Amortization expense from continuing operations was $8,930 and $8,431 for the years ended December 31, 2021 and 2020, respectively.
At July 22, 2020, the Company recorded $5,200 of definite-lived intangible assets and accumulated amortization of $647 related to the assignment of OpenNMS (see Note 19). These intangible assets are amortized over a period of 4 to 6 years.
The estimated future amortization expense over the next five years and thereafter for the intangible assets that exist as of December 31, 2021 is as follows:
Amounts
2022$8,930 
20234,346 
20244,283 
20254,147 
20263,467 
Thereafter13,866 
Total future intangible amortization expense$39,039