CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Allowance for doubtful accounts	$ 0	$ 0
Accumulated depreciation and amortization	$ 9,955	$ 7,925
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	275,000,000,000	250,000,000,000
Common stock, shares issued (in shares)	231,073,471,000	212,529,313,000
Common stock, shares outstanding (in shares)	230,953,850,000	212,409,692,000
Treasury stock, shares (in shares)	119,621,000	119,621,000
Convertible Preferred Stock
Preferred stock, par value (in usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	10,000,000,000	10,000,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0