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Goodwill and Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Changes in Gross Carrying Amount of Goodwill The following table displays the changes in the gross carrying amount of goodwill:
 Amount
 (in thousands)
Balance at December 31, 2018$88,420 
NetFort acquisition9,446 
Balance at December 31, 2019$97,866 
DivvyCloud acquisition115,735 
Balance at December 31, 2020$213,601 
Schedule of Identifiable Intangible Assets
The following table presents details of our intangible assets which include acquired identifiable intangible assets and capitalized internal-use software costs:
 Weighted-
Average Estimated Useful Life (years)
As of December 31, 2020As of December 31, 2019
 Gross Carrying
Amount
Accumulated
Amortization
Net Book ValueGross Carrying
Amount
Accumulated
Amortization
Net Book Value
  (in thousands)
Intangible assets subject to amortization:
Developed technology5.6$54,455 $(24,780)$29,675 $35,855 $(16,080)$19,775 
Customer relationships6.32,700 (958)1,742 1,000 (641)359 
Trade names5.41,419 (639)780 519 (519)— 
Non-compete agreements2.040 (40)— 40 (40)— 
Total acquired intangible assets3.058,614 (26,417)32,197 37,414 (17,280)20,134 
Internal-use software16,002 (3,903)12,099 9,873 (1,446)8,427 
Total intangible assets$74,616 $(30,320)$44,296 $47,287 $(18,726)$28,561 
Schedule of Estimated Amortization Expense
Estimated future amortization expense of the acquired identifiable intangible assets and completed capitalized internal-use software costs as of December 31, 2020 is as follows (in thousands):
2021$13,039 
202210,168 
20237,283 
20243,868 
20253,443 
2026 and thereafter1,128 
Total$38,929