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Goodwill and intangible assets
 9 Months Ended
Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and intangible assets Goodwill and intangible assets
Goodwill
The changes in the carrying amounts of goodwill were as follows (in thousands):
Balance as of December 31, 2019
 
$
126,777

Goodwill acquired - Diploid
 
50,655

Goodwill acquired - Genelex
 
4,067

Goodwill acquired - YouScript
 
29,726

Balance as of September 30, 2020
 
$
211,225


Intangible assets
The following table presents details of our intangible assets (in thousands):
 
September 30, 2020
 
December 31, 2019
 
Cost
 
Accumulated
Amortization
 
Net
 
Weighted-Average
Useful Life
(in Years)
 
Cost
 
Accumulated
Amortization
 
Net
 
Weighted-Average
Useful Life
(in Years)
Customer relationships
$
23,763

 
$
(7,241
)
 
$
16,522

 
10.0
 
$
23,763

 
$
(5,141
)
 
$
18,622

 
10.0
Developed technology
161,110

 
(21,038
)
 
140,072

 
8.6
 
84,396

 
(8,476
)
 
75,920

 
8.6
Non-compete agreement
286

 
(215
)
 
71

 
5.0
 
286

 
(172
)
 
114

 
5.0
Trade name
576

 
(570
)
 
6

 
2.7
 
576

 
(480
)
 
96

 
2.7
Patent licensing agreement
496

 
(95
)
 
401

 
15.0
 
496

 
(70
)
 
426

 
15.0
Favorable leases
247

 
(247
)
 
—

 
2.2
 
247

 
(238
)
 
9

 
2.2
In-process research and development
29,988

 
—

 
29,988

 
n/a
 
29,988

 
—

 
29,988

 
n/a
 
$
216,466

 
$
(29,406
)
 
$
187,060

 
8.8
 
$
139,752

 
$
(14,577
)
 
$
125,175

 
8.9


Acquisition-related intangibles included in the above table are finite-lived, other than in-process research and development which has an indefinite life, and are carried at cost less accumulated amortization. Customer relationships are being amortized on an accelerated basis, in proportion to estimated cash flows. All other finite-lived acquisition-related intangibles are being amortized on a straight-line basis over their estimated lives, which approximates the pattern in which the economic benefits of the intangible assets are realized. Amortization expense was $5.6 million and $2.2 million for the three months ended September 30, 2020 and 2019, respectively, and $14.8 million and $4.9 million for the nine months ended September 30, 2020 and 2019, respectively. Amortization expense is recorded to cost of revenue, research and development, sales and marketing and general and administrative expense.
The following table summarizes our estimated future amortization expense of intangible assets with finite lives as of September 30, 2020 (in thousands):
2020 (remainder of year)
$
5,597

2021
22,792

2022
21,087

2023
20,074

2024
19,796

Thereafter
67,726

Total estimated future amortization expense
$
157,072