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Consolidated Balance Sheets (Parenthetical) - SFr / shares
Dec. 31, 2020
Dec. 31, 2019
Statement Of Financial Position [Abstract]    
Common stock, par value SFr 0.03 SFr 0.03
Common stock, shares authorized 115,172,786 103,901,006
Common stock, shares issued 74,110,160 61,034,025
Common stock, shares outstanding 73,914,844 60,783,799
Treasury stock, shares 195,316 250,226