Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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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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The net result for the period of deducting operating expenses from operating revenues.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Business Segment Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
Business Segment Information (Details) $ in Thousands	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2017 segment	Sep. 30, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of business segments \| segment			3
Net revenues	$ 73,611	$ 29,135
Operating income (loss)	7,766	(180)
Identifiable assets	$ 173,113			$ 191,623
Semiconductor \| Product Concentration Risk \| Sales Revenue, Product Line
Segment Reporting Information [Line Items]
Concentration risk, percentage (less than)	25.00%
Operating Segments \| Solar
Segment Reporting Information [Line Items]
Net revenues	$ 49,197	11,424
Operating income (loss)	5,352	(1,023)
Identifiable assets	76,794			97,999
Operating Segments \| Semiconductor
Segment Reporting Information [Line Items]
Net revenues	20,891	15,703
Operating income (loss)	3,004	2,361
Identifiable assets	58,706			57,177
Operating Segments \| Polishing
Segment Reporting Information [Line Items]
Net revenues	3,523	2,008
Operating income (loss)	1,104	464
Identifiable assets	5,912			5,078
Non-Segment
Segment Reporting Information [Line Items]
Operating income (loss)	(1,694)	$ (1,982)
Identifiable assets	$ 31,701			$ 31,369