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Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Restructuring | $ 2,041 | $ 398
Inventory step-up and backlog amortization | 0 | 12
Amortization of acquired intangible assets | 1,496 |
Cost of revenue |  |
Amortization of acquired intangible assets | 1,192 | 1,192
Stock-based compensation | 432 | 367
Restructuring | 173 | 0
Inventory step-up and backlog amortization | 0 | 12
Amortization of acquired intangible assets | 1,192 |
Research and development |  |
Stock-based compensation | 2,943 | 2,545
Selling, general and administrative |  |
Stock-based compensation | 4,296 | 3,737
Amortization of acquired intangible assets | $ 304 | $ 312

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