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Subsequent Event (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended
	Apr. 30, 2022	Jan. 31, 2022	Mar. 31, 2022	Mar. 31, 2021
Subsequent Event
Investment in subsidiary with noncontrolling interest			$ 206	$ 576
Loan from related party | Beijing Tongmei Xtal Technology | ChaoYang XinMei High Purity Semiconductor Materials Co., Ltd
Subsequent Event
Increase in noncontrolling interest		$ 2,200
Increase in redeemable noncontrolling interests		$ 200
Percentage of ownership, equity method		58.50%
Subsequent Event | Loan from related party | ChaoYang XinMei High Purity Semiconductor Materials Co., Ltd
Subsequent Event
Investment in subsidiary with noncontrolling interest	$ 4,500
Increase in redeemable noncontrolling interests	100
Subsequent Event | Loan from related party | Beijing Tongmei Xtal Technology | ChaoYang XinMei High Purity Semiconductor Materials Co., Ltd
Subsequent Event
Amount paid to subsidiary	1,100
Investment in subsidiary with noncontrolling interest	2,600
Increase in noncontrolling interest	$ 800
Percentage of ownership, equity method	58.50%
Subsequent Event | Loan from related party | ChaoYang Xinshuo | ChaoYang XinMei High Purity Semiconductor Materials Co., Ltd
Subsequent Event
Amount paid to subsidiary	$ 700
Investment in subsidiary with noncontrolling interest	$ 1,900

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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Net Increase or Decrease in balance of noncontrolling interest in the subsidiary during the reporting period.

+ References

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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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