Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Stockholders' equity
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	50,000,000	25,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	250,000,000	750,000,000
Common stock, shares issued	49,999,999	508,065,495
Treasury stock, shares	0	1,652,771
Debt Instrument [Line Items]
Future interest payable - current	$ 68,008	$ 102,294
Future interest payable - long-term	70,000	2,232,570
Future interest payable on senior secured notes
Debt Instrument [Line Items]
Future interest payable - current	0	86,054
Future interest payable - long-term	$ 0	$ 78,860