Quarterly report pursuant to Section 13 or 15(d)

NET INCOME (LOSS) PER SHARE - Antidilutive Shares (Details)

v3.19.1
NET INCOME (LOSS) PER SHARE - Antidilutive Shares (Details) - shares
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive shares 25,830,000 0  
Stock options      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive shares 18,580,000 0  
Performance stock options      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive shares 7,250,000 0  
Options Outside the Amended 2013 Plan [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Unvested stock options excluded from anti-dilutive shares     0
Options Outside the Amended 2013 Plan [Member] | Amended 2013 Plan [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Unvested stock options excluded from anti-dilutive shares 10,750,000 10,750,000 10,750,000