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Purchased Intangible Assets and Goodwill
 9 Months Ended
Oct. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Purchased Intangible Assets and Goodwill
Note 7. Purchased Intangible Assets and Goodwill
The following tables summarize the purchased intangible asset balances (in thousands):
October 31, 2022
Gross Carrying AmountAccumulated AmortizationNet Carrying Amount
Developed technology$19,563 $(8,694)$10,869 
Customer relationships5,186 (3,085)2,101 
Trade name1,708 (748)960 
Total$26,457 $(12,527)$13,930 
January 31, 2022
Gross Carrying AmountAccumulated AmortizationNet Carrying Amount
Developed technology$9,271 $(7,692)$1,579 
Customer relationships4,287 (2,717)1,570 
Trade name909 (606)303 
Total$14,467 $(11,015)$3,452 
Purchased intangible assets are being amortized to Cost of subscription revenue in the accompanying unaudited condensed consolidated statements of comprehensive loss on a straight-line basis over their estimated useful lives ranging from three to ten years. The following table summarizes amortization expense recognized on purchased intangible assets during the periods indicated (in thousands):
Three Months Ended October 31,Nine Months Ended October 31,
2022202120222021
Purchased intangible assets amortization expense$586 $554 $1,512 $1,496 
Estimated future amortization expense for purchased intangible assets as of October 31, 2022 was as follows (in thousands);
Fiscal year ending:
2023 (remainder of the year)$738 
20242,952 
20252,507 
20261,873 
20271,560 
Thereafter4,300 
Total estimated amortization expense$13,930 
The following table represents the changes to goodwill (in thousands):
Goodwill
Balance, January 31, 2022$17,632 
Addition from acquisition35,009 
Effects of foreign currency translation(23)
Balance, October 31, 2022$52,618