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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - shares
3 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Issuance of shares of Common Stock upon exercise of stock options and restricted stock units 390,001 389,512 936,688 772,538
Issuance of shares of Common Stock under the ESPP 153,082   175,615  
Issuance of shares of Common Stock for services rendered 1,288 1,357 1,403 1,957
Convertible Senior Notes 1.25 Percent Due 2020        
Issuance of shares of Common Stock upon conversion of convertible senior notes     3,187