Stockholders' Equity and Noncontrolling Interests	12 Months Ended
Dec. 31, 2021
Noncontrolling Interest [Abstract]
Stockholders' Equity and Noncontrolling Interests	10. STOCKHOLDERS’ EQUITY AND NONCONTROLLING INTERESTS Equity Financings During April 2021, the Company completed an underwritten public offering of 3.7 million shares of the Company’s common stock, for which the Company received net proceeds of approximately $192.8 million, after deducting the underwriting discounts and offering expenses payable by the Company. Noncontrolling Interests QGT, through its wholly-owned subsidiary in Singapore, owns part of the outstanding shares of Cinos Korea, a South Korean company that provides outsourced cleaning and recycling of precision parts for the semiconductor industry through its operating facilities in South Korea and through a partial interest in Cinos China. The carrying value of the remaining interest held by another shareholder in Cinos Korea and the remaining interest in Cinos China are presented as noncontrolling interests in the accompanying Consolidated Financial Statements. The fair values of the noncontrolling interests were estimated based on the values of Cinos Korea and Cinos China on a 100.0% basis. The values were calculated based on the pro-rata portion of total QGT earnings before interest expense, taxes, depreciation and amortization contributed by each entity. On July 24, 2021, the Company entered into an amendment with Cinos Korea and a shareholder of Cinos Korea to eliminate the obligation to purchase certain shares of the common stock owned by the shareholder. As a result, the carrying amount of noncontrolling interest in Cinos Korea was increased by 35.0%. The common stock purchase obligation of $16.5 million was reclassified to noncontrolling interest in the third quarter of fiscal 2021. Rovac Pte, Ltd., which is based in Singapore, is a majority-owned company of Ham-Let. The carrying value of the remaining interest held by another shareholder in Rovac is presented as noncontrolling interests in the accompanying Consolidated Financial Statements.

Stockholders' Equity and Noncontrolling Interests

12 Months Ended

Dec. 31, 2021

Stockholders' Equity and Noncontrolling Interests

10. STOCKHOLDERS’ EQUITY AND NONCONTROLLING INTERESTS

Equity Financings

During April 2021, the Company completed an underwritten public offering of 3.7 million shares of the Company’s common stock, for which the Company received net proceeds of approximately $192.8 million, after deducting the underwriting discounts and offering expenses payable by the Company.

Noncontrolling Interests

QGT, through its wholly-owned subsidiary in Singapore, owns part of the outstanding shares of Cinos Korea, a South Korean company that provides outsourced cleaning and recycling of precision parts for the semiconductor industry through its operating facilities in South Korea and through a partial interest in Cinos China.

The carrying value of the remaining interest held by another shareholder in Cinos Korea and the remaining interest in Cinos China are presented as noncontrolling interests in the accompanying Consolidated Financial Statements. The fair values of the noncontrolling interests were estimated based on the values of Cinos Korea and Cinos China on a 100.0% basis. The values were calculated based on the pro-rata portion of total QGT earnings before interest expense, taxes, depreciation and amortization contributed by each entity.

On July 24, 2021, the Company entered into an amendment with Cinos Korea and a shareholder of Cinos Korea to eliminate the obligation to purchase certain shares of the common stock owned by the shareholder. As a result, the carrying amount of noncontrolling interest in Cinos Korea was increased by 35.0%. The common stock purchase obligation of $16.5 million was reclassified to noncontrolling interest in the third quarter of fiscal 2021.

Rovac Pte, Ltd., which is based in Singapore, is a majority-owned company of Ham-Let. The carrying value of the remaining interest held by another shareholder in Rovac is presented as noncontrolling interests in the accompanying Consolidated Financial Statements.