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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 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 22,668,142 27,211,831 22,668,142 27,211,831
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 7,797,075 10,197,507 7,797,075 10,197,507
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 3,007,032 5,150,289 3,007,032 5,150,289
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 11,864,035 11,864,035