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Goodwill and Intangible Assets
 3 Months Ended
Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
Goodwill was $253.3 million and $213.6 million as of March 31, 2021 and December 31, 2020, respectively. The following table displays the changes in the gross carrying amount of goodwill:
Amount
 (in thousands)
Balance at December 31, 2020$213,601 
Alcide acquisition39,723 
Balance at March 31, 2021$253,324 
The following table presents details of our intangible assets, which include acquired identifiable intangible assets and capitalized internal-use software costs:
  As of March 31, 2021As of December 31, 2020
 Weighted-
Average
Life (years)		Gross Carrying
Amount		Accumulated
Amortization		Net Book ValueGross Carrying
Amount		Accumulated
Amortization		Net Book Value
  (in thousands)
Intangible assets subject to amortization:
Developed technology5.7$64,855 $(27,521)$37,334 $54,455 $(24,780)$29,675 
Customer relationships6.32,700 (1,061)1,639 2,700 (958)1,742 
Trade names5.41,419 (684)735 1,419 (639)780 
Total acquired intangible assets68,974 (29,266)39,708 58,574 (26,377)32,197 
Internal-use software3.017,760 (4,760)13,000 16,002 (3,903)12,099 
Total intangible assets$86,734 $(34,026)$52,708 $74,576 $(30,280)$44,296 
Amortization expense was $3.7 million and $2.1 million for the three months ended March 31, 2021 and 2020, respectively.
Estimated future amortization expense of the acquired identifiable intangible assets and completed capitalized internal-use software costs as of March 31, 2021 was as follows (in thousands):
2021 (for the remaining nine months)$10,929 
202211,934 
20239,048 
20245,605 
20255,177 
2026 and thereafter2,987 
Total$45,680 
The table above excludes the impact of $7.0 million of capitalized internal-use software costs for projects that have not been completed as of March 31, 2021, and therefore, we have not determined the useful life of the software, nor have all the costs associated with these projects been incurred.