Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Property plant and equipment, accumulated amortization and depreciation	$ 49,433	$ 47,201
Acquired intangible assets, accumulated amortization	$ 13,335	$ 11,841
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	400,000,000	400,000,000
Common stock, shares issued	247,511,769	196,090,980
Series C-1 Convertible Preferred Stock [Member]
Series C-1 convertible preferred stock, shares designated	0	12,459
Series C-1 convertible preferred stock, shares issued	0	12,459
Series C-1 convertible preferred stock, shares outstanding	0	12,459
Series A-1 convertible preferred stock [Member]
Series A-1 convertible preferred stock, shares designated	31,620	31,620
Series A-1 convertible preferred stock, shares issued	31,620	31,620
Series A-1 convertible preferred stock, shares outstanding	31,620	31,620
Series A-1 convertible preferred stock, liquidation value	$ 33,408