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Goodwill and other intangible assets
 3 Months Ended
Mar. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and other intangible assets Goodwill and other intangible assets
The change in the carrying amount of goodwill was as follows:
Three Months Ended March 31,
20222021
(in thousands)
Goodwill, beginning of period$845,734 $541,480 
Goodwill acquired3,014 370 
Foreign currency translation adjustment(6,764)— 
Goodwill, end of period$841,984 $541,850 
The gross carrying amount and accumulated amortization of intangible assets other than goodwill were as follows:
March 31, 2022
Useful LifeGross ValueAccumulated
Amortization		Net Carrying
Value		Weighted‑
Average
Remaining
Useful Life
(in thousands)
Trademarks
3 - 8 years
$34,680 $18,891 $15,789 3.6 years
Customer relationships
2 ‑ 12 years
248,959 80,934 168,025 8.0 years
Developed technology
5 - 6.5 years
115,677 52,186 63,491 5.0 years
Non‑competes
2 - 3 years
1,711 511 1,200 1.8 years
Order backlog
2.5 years
3,688 1,121 2,567 1.8 years
Total intangible assets$404,715 $153,643 $251,072 
December 31, 2021
Useful LifeGross ValueAccumulated
Amortization		Net Carrying
Value		Weighted‑
Average
Remaining
Useful Life
(in thousands)
Trademarks
3 - 8 years
$34,690 $17,788 $16,902 3.8 years
Customer relationships
2 ‑ 12 years
249,495 75,600 173,895 8.3 years
Developed technology
5 - 6.5 years
116,193 47,142 69,051 5.1 years
Non‑competes
2 - 2.5 years
1,797 439 1,358 2.0 years
Order backlog
2.5 years
3,745 758 2,987 2.0 years
Total intangible assets subject to amortization405,920 141,727 264,193 
IPR&DIndefinite400 — 400 
Total intangible assets$406,320 $141,727 $264,593 
The gross value in the tables above includes a cumulative foreign currency translation adjustment of $(4.3) million and $(2.1) million as of March 31, 2022 and December 31, 2021, respectively. The accumulated amortization in the table above includes a cumulative foreign currency translation adjustment of $(0.3) million as of March 31, 2022. The cumulative foreign currency translation adjustment for accumulated amortization was not material as of December 31, 2021.
Amortization expense was $12.2 million and $8.4 million for the three months ended March 31, 2022 and 2021, respectively.
There were no impairments to goodwill during the three months ended March 31, 2022 and 2021. There were no material impairments to intangible assets during the three months ended March 31, 2022 and 2021.