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Basis of Presentation (Details)		1 Months Ended			3 Months Ended	9 Months Ended	12 Months Ended
	Jun. 15, 2018 USD ($)	Aug. 31, 2020 USD ($)	May 31, 2019 USD ($)	Sep. 30, 2018 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2020 USD ($) company	Dec. 31, 2019 company	Jul. 31, 2020	Apr. 30, 2019	Mar. 11, 2019	Mar. 10, 2019	Aug. 31, 2018	Jun. 14, 2018
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of equity method investments | company						5	5
Additional percentage of ownership, consolidated method				2
Proceeds from Divestiture of Interest in Consolidated Subsidiaries					$ 366,000	$ 366,000
Nanjing JinMei Gallium Co., Ltd Investment
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Additional percentage of ownership, consolidated method	12		3
Purchase of subsidiary shares from noncontrolling interest	$ 1,400,000		$ 413,000	$ 252,000
Chaoyang JinMei Gallium Co., Ltd[member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Additional percentage of ownership, consolidated method		8.5
Purchase of subsidiary shares from noncontrolling interest		$ 396,000
Percentage Of Ownership Interest Sold		8.50%
Proceeds from Divestiture of Interest in Consolidated Subsidiaries		$ 396,000
Beijing JiYa Semiconductor Material Co., Ltd
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Percentage of ownership, consolidated method (in hundredths)										39.00%	46.00%
Nanjing JinMei Gallium Co., Ltd Investment
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Percentage of ownership, consolidated method (in hundredths)			100.00%						97.00%
Nanjing JinMei Gallium Co., Ltd Investment | Nanjing JinMei Gallium Co., Ltd Investment
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Percentage of ownership, consolidated method (in hundredths)						100.00%						95.00%	83.00%
Chaoyang JinMei Gallium Co., Ltd[member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Percentage of ownership, consolidated method (in hundredths)		91.50%						100.00%
Chaoyang JinMei Gallium Co., Ltd[member] | Chaoyang JinMei Gallium Co., Ltd[member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Percentage of ownership, consolidated method (in hundredths)		91.50%				91.50%		100.00%
Percentage Of Ownership Interest Sold		8.50%
Proceeds from Divestiture of Interest in Consolidated Subsidiaries		$ 396,000

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