CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Preferred stock par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock authorized (in shares)	33,333	33,333
Common stock par value (in dollars per share)	$ 0.001	$ 0.001
Common stock authorized (in shares)	166,500,000	131,500,000
Common stock issued (in shares)	73,716,760	57,979,725
Common stock outstanding (in shares)	73,716,760	57,979,725
Series O Preferred Stock
Preferred stock issued (in shares)	12,575	12,575
Preferred stock outstanding (in shares)	12,575	12,575
Preferred stock liquidation preference	$ 25,150	$ 25,150
Series X Preferred Stock
Preferred stock issued (in shares)	4,429	0
Preferred stock outstanding (in shares)	4,429	0
Preferred stock liquidation preference	$ 44,290	$ 0