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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Sep. 30, 2022
Dec. 31, 2021
Stockholders' equity:    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 300,000,000 300,000,000
Common stock, shares issued (in shares) 142,017,411 141,210,015
Common stock, shares outstanding (in shares) 142,017,411 141,210,015
0 Percent Convertible Senior Notes [Member]    
LIABILITIES AND STOCKHOLDERS' EQUITY    
Interest rate on convertible senior notes 0.00% 0.00%
0.125 Percent Convertible Senior Notes [Member]    
LIABILITIES AND STOCKHOLDERS' EQUITY    
Interest rate on convertible senior notes 0.125% 0.125%