Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Allowance for doubtful accounts receivable	$ 50	$ 50
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	500,000,000	425,000,000
Common stock, shares issued	56,298,216	6,121,821
Common stock, shares outstanding	56,298,216	6,121,821
Series E Convertible Preferred Stock
Convertible preferred stock, par value	$ 0.01	$ 0.01
Convertible preferred stock, authorized	0	77,150,132
Convertible preferred stock, issued	0	73,795,777
Convertible preferred stock, outstanding	0	73,795,777
Series D Convertible Preferred Stock
Convertible preferred stock, par value	$ 0.01	$ 0.01
Convertible preferred stock, authorized	0	39,540,611
Convertible preferred stock, issued	0	39,540,611
Convertible preferred stock, outstanding	0	39,540,611
Series C Convertible Preferred Stock
Convertible preferred stock, par value	$ 0.01	$ 0.01
Convertible preferred stock, authorized	0	47,242,235
Convertible preferred stock, issued	0	47,242,235
Convertible preferred stock, outstanding	0	47,242,235
Series B Convertible Preferred Stock
Convertible preferred stock, par value	$ 0.01	$ 0.01
Convertible preferred stock, authorized	0	29,468,101
Convertible preferred stock, issued	0	29,468,101
Convertible preferred stock, outstanding	0	29,468,101
Series A Convertible Preferred Stock
Convertible preferred stock, par value	$ 0.01	$ 0.01
Convertible preferred stock, authorized	0	134,704,785
Convertible preferred stock, issued	0	134,704,785
Convertible preferred stock, outstanding	0	134,704,785
Limited Common Stock
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	146,199,885
Common stock, shares issued	13,164,193	0
Common stock, shares outstanding	13,164,193	0