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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Issuance of shares of Common Stock upon exercise of stock options and restricted stock units	2,657,892	1,624,376	3,012,937
Issuance of shares of Common Stock under the ESPP	239,590	233,712	157,277
Issuance of shares of Common Stock for services rendered	5,688	4,905	2,532
Issuance of shares of Common Stock			4,945,000
Convertible Senior Notes 1.25 Percent Due 2020
Issuance of shares of Common Stock upon conversion of convertible senior notes			7,095,350
Convertible Senior Notes 0.375 Percent Due 2018
Issuance of shares of Common Stock upon conversion of convertible senior notes		148,761	7,201,058

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Number of shares issued during the period as a result of the conversion of convertible securities.

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