CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Allowances for doubtful accounts	$ 0
Accumulated depreciation	$ 7,925
Accumulated depreciation		$ 4,316
Preferred stock, par value (in USD per share)	$ 0.01
Preferred stock, shares authorized (in shares)	10,000,000
Common stock, par value (in USD per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	250,000,000	250,000,000
Common stock, shares issued (in shares)	212,529,313	190,445,795
Common stock, shares outstanding (in shares)	212,409,692	190,411,070
Treasury stock, shares (in shares)	119,621	34,725
Convertible preferred stock
Preferred stock, par value (in USD per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0