Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED BALANCE SHEETS (Parenthetical)

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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accounts receivable, net of allowance $ 19 $ 331
Preferred stock par value $ 0.001 $ 0.001
Preferred stock shares authorized 10,000,000 10,000,000
Common stock, par value $ 0.001 $ 0.001
Common stock, authorized 300,000,000 300,000,000
Common stock, issued 43,984,975 39,772,238
Common stock, outstanding 43,984,975 39,772,238
Series A Preferred Stock    
Preferred stock shares authorized 1,684,375 1,684,375
Preferred stock shares issued 0 0
Preferred stock shares outstanding 0 0
Series B Preferred Stock    
Preferred stock shares authorized 1,580,790 1,580,790
Preferred stock shares issued 926,942 926,942
Preferred stock shares outstanding 926,942 926,942
Preferred stock liquidation preference $ 18,075  
Nonvoting Common Stock [Member]    
Common stock, par value $ 0.001 $ 0.001
Common stock, authorized 3,553,000 3,553,000
Common stock, issued 896 3,540,132
Common stock, outstanding 896 3,540,132