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Goodwill and Intangible Assets - Intangible assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross | $ 162,153 |  | $ 162,153 |  | $ 207,198
Accumulated Amortization | (131,902) |  | (131,902) |  | (179,115)
Net | 30,251 |  | $ 30,251 |  | 28,083
Weighted Average Useful Life Remaining (in years) |  |  | 5 years 1 month 6 days |  |
Amortization expense | 2,690 | $ 4,260 | $ 7,619 | $ 12,806 |
Customer relationships |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross | 59,059 |  | 59,059 |  | 71,123
Accumulated Amortization | (50,063) |  | (50,063) |  | (56,682)
Net | 8,996 |  | $ 8,996 |  | 14,441
Weighted Average Useful Life Remaining (in years) |  |  | 3 years 1 month 6 days |  |
Acquired technology |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross | 17,302 |  | $ 17,302 |  | 42,472
Accumulated Amortization | (16,199) |  | (16,199) |  | (41,201)
Net | 1,103 |  | $ 1,103 |  | 1,271
Weighted Average Useful Life Remaining (in years) |  |  | 6 years |  |
Trade names |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross | 13,775 |  | $ 13,775 |  | 17,477
Accumulated Amortization | (10,150) |  | (10,150) |  | (16,506)
Net | 3,625 |  | $ 3,625 |  | 971
Weighted Average Useful Life Remaining (in years) |  |  | 1 year 10 months 24 days |  |
Patent costs |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross | 21,384 |  | $ 21,384 |  | 19,828
Accumulated Amortization | (11,502) |  | (11,502) |  | (10,999)
Net | 9,882 |  | $ 9,882 |  | 8,829
Weighted Average Useful Life Remaining (in years) |  |  | 4 years 9 months 18 days |  |
Trade secrets |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross | 19,755 |  | $ 19,755 |  | 20,188
Accumulated Amortization | (18,590) |  | (18,590) |  | (18,216)
Net | 1,165 |  | $ 1,165 |  | 1,972
Weighted Average Useful Life Remaining (in years) |  |  | 1 year 9 months 18 days |  |
Acquired patents |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross | 16,252 |  | $ 16,252 |  | 16,317
Accumulated Amortization | (15,889) |  | (15,889) |  | (15,723)
Net | 363 |  | $ 363 |  | 594
Weighted Average Useful Life Remaining (in years) |  |  | 7 years 9 months 18 days |  |
Other |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross | 14,626 |  | $ 14,626 |  | 19,793
Accumulated Amortization | (9,509) |  | (9,509) |  | (19,788)
Net | $ 5,117 |  | $ 5,117 |  | $ 5
Weighted Average Useful Life Remaining (in years) |  |  | 6 years 1 month 6 days |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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