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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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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of restructuring charges, remediation cost, and asset impairment loss.

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