Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property plant and equipment, accumulated amortization and depreciation	$ 42,861	$ 38,068
Acquired intangible assets, accumulated amortization	$ 9,431	$ 7,472
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	240,000,000
Common stock, shares issued	137,818,068	119,996,331
Series C-1 Convertible Preferred Stock [Member]
Series C-1 convertible preferred stock, shares designated	12,459	18,459
Series C-1 convertible preferred stock, shares issued	12,459	18,459
Series C-1 convertible preferred stock, shares outstanding	12,459	18,459
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	$ 33,040	$ 32,832