Investments in Privately-Held Raw Material Companies - Gain on Deconsolidation (Details) - USD ($)	3 Months Ended	6 Months Ended
Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 12, 2019
Investments in Privately-Held Raw Material Companies
Fair value of the consideration received	$ 366,000	$ 366,000
Fair value of the retained investment in Beijing JiYa Semiconductor Material Co., Ltd.	2,040,000			$ 2,040,000
Carrying value of non-controlling interest, net of accumulated other comprehensive income attributable to subsidiary	617,000
Derecognition of Beijing JiYa Semiconductor Material Co., Ltd.'s net asset	(2,848,000)
Gain recognized on deconsolidation of Beijing JiYa Semiconductor Material Co., Ltd.	175,000		$ 175,000
Carrying value of retained noncontrolling investment	(1,559,000)
Gain on retained noncontrolling investment due to remeasurement	$ 481,000

The amount of derecognition of net assets.

No definition available.

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- Definition

The carrying value of noncontrolling interest net of accumulated comprehensive income attributable to subsidiary.

+ References

No definition available.

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The carrying amount as on the balance sheet date of retained noncontrolling investment.

+ References

No definition available.

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Amount of gain (loss) from deconsolidation of subsidiary and derecognition of group of assets constituting transfer of business or nonprofit activity, excluding conveyance of oil and gas mineral rights and transfer of good or service in contract with customer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1B
-Subparagraph (a)
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- Definition

Amount of gain (loss) from remeasurement to fair value of retained investment in former subsidiary and group of assets constituting business or nonprofit activity deconsolidated and derecognized, excluding conveyance of oil and gas mineral rights and transfer of product or service in contract with customer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1B
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4582445-111684

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- Definition

The cash inflow associated with the deconsolidation of a previously consolidated subsidiary or the sale of investment in consolidated subsidiaries (generally greater than 50 percent).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
-Paragraph 12
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Fair value portion of interest continued to be held by a transferor after transferring financial assets to a third party.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 10
-Section 15
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