Segment Reporting and Geographic Information (Details) $ in Thousands	3 Months Ended
Mar. 31, 2021 USD ($) segment item	Mar. 31, 2020 USD ($)
Revenue reporting by end-market and geographic region
Number of operating segments \| segment	1
Number of reportable segments \| segment	1
Number of key markets \| item	4
Sale by end-market	$ 133,714	$ 104,502
United States
Revenue reporting by end-market and geographic region
Sale by end-market	45,162	39,635
EMEA
Revenue reporting by end-market and geographic region
Sale by end-market	13,625	16,150
China
Revenue reporting by end-market and geographic region
Sale by end-market	20,007	10,472
Rest of APAC
Revenue reporting by end-market and geographic region
Sale by end-market	54,877	37,943
Rest Of World
Revenue reporting by end-market and geographic region
Sale by end-market	43	302
Semiconductor
Revenue reporting by end-market and geographic region
Sale by end-market	51,631	37,423
Compound Semiconductor
Revenue reporting by end-market and geographic region
Sale by end-market	24,751	18,430
Data Storage
Revenue reporting by end-market and geographic region
Sale by end-market	40,980	38,883
Scientific & Other
Revenue reporting by end-market and geographic region
Sale by end-market	$ 16,352	$ 9,766

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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