Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Accounts receivable, net of allowance for doubtful accounts $ 0 $ 0
Preferred stock, shares authorized 40,000,000 40,000,000
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 275,000,000 275,000,000
Common stock, shares issued 80,024,218 78,632,810
Common stock, shares outstanding 80,024,218 78,632,810
Series A Preferred Stock    
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares issued 4,045,000 4,045,000
Preferred stock, shares outstanding 4,045,000 4,045,000
Liquidation Preference $ 25.00 $ 25.00
Series B Preferred Stock    
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares issued 2,140,000 2,140,000
Preferred stock, shares outstanding 2,140,000 2,140,000
Liquidation Preference $ 25.00 $ 25.00