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Goodwill and Intangible Assets
 3 Months Ended
Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
Goodwill was $97.9 million as of March 31, 2020 and December 31, 2019.
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, 2020As of December 31, 2019
 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 technology
5.4$35,855  $(17,738) $18,117  $35,855  $(16,080) $19,775  
Customer relationships
6.71,000  (673) 327  1,000  (641) 359  
Trade names
6.1519  (519) —  519  (519) —  
Non-compete agreements
2.040  (40) —  40  (40) —  
Total acquired intangible assets37,414  (18,970) 18,444  37,414  (17,280) 20,134  
Internal-use software
3.011,347  (1,924) 9,423  9,873  (1,446) 8,427  
Total intangible assets$48,761  $(20,894) $27,867  $47,287  $(18,726) $28,561  
Amortization expense was $2.1 million and $1.6 million for the three months ended March 31, 2020 and 2019, respectively.
Estimated future amortization expense of the acquired identifiable intangible assets and completed capitalized internal-use software costs as of March 31, 2020 was as follows (in thousands):
2020 (for the remaining nine months)$6,469  
20217,841  
20224,970  
20232,667  
2024304  
2025 and thereafter—  
Total$22,251  
The table above excludes the impact of $5.6 million of capitalized internal-use software costs for projects that have not been completed as of March 31, 2020, and therefore, we have not determined the useful life of the software, nor have all the costs associated with these projects been incurred.