Quarterly report pursuant to Section 13 or 15(d)

EQUITY (Antidilutive Securities Excluded from Computation of Earnings per Share) (Details)

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EQUITY (Antidilutive Securities Excluded from Computation of Earnings per Share) (Details) - shares
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding 23,264,207 26,709,372
Options to purchase shares of common stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding 8,334,027 11,050,847
Restricted and deferred stock awards—unvested [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding 3,066,145 3,794,490
Conversion shares related to the convertible senior notes [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding 11,864,035 11,864,035