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Compensation Related Costs, Share Based Payments (Policies) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Share-based Payment Arrangement | The following table summarizes stock-based compensation expense included in the Consolidated Statements of Operations:
|  |  | Year ended December 31,
(in thousands) |  |  |  |  | 2020 |  | 2019 |  | 2018
Cost of revenue |  |  |  |  | $ | 1,548 |  |  | $ | 1,902 |  |  | $ | 1,954 |
Research and development |  |  |  |  | 13,415 |  |  | 17,167 |  |  | 19,636 |
Sales and marketing |  |  |  |  | 5,779 |  |  | 8,043 |  |  | 9,459 |
General and administrative |  |  |  |  | 9,221 |  |  | 10,076 |  |  | 9,838 |
Total stock-based compensation expense |  |  |  |  | $ | 29,963 |  |  | $ | 37,188 |  |  | $ | 40,887 |

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- Definition Disclosure of accounting policy for award under share-based payment arrangement. Includes, but is not limited to, methodology and assumption used in measuring cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b),(f) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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