CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Issuance of shares of Common Stock upon exercise of stock options and settlement of employee restricted stock units and performance shares	1,324,926	2,677,810	2,657,892
Issuance of shares of Common Stock under the ESPP	264,503	258,453	239,590
Issuance of shares of Common Stock for services rendered	5,675	6,350	5,688
Convertible Senior Notes 1.25 Percent Due 2020
Issuance of shares of Common Stock upon conversion of convertible senior notes		368,886