Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical)

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CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Accounts receivable, net of allowance $ 39 $ 12
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, authorized 10,000 10,000
Common stock, par value (in dollars per shares) $ 0.001 $ 0.001
Common stock, authorized 300,000 300,000
Common stock, issued 49,838 45,771
Common stock, outstanding 49,838 45,771
Series A Preferred Stock [Member]    
Preferred stock, authorized 1,684 1,684
Preferred stock, issued
Preferred stock, outstanding
Series B Preferred Stock [Member]    
Preferred stock, authorized 1,581 1,581
Preferred stock, issued 927 927
Preferred stock, outstanding 927 927
Liquidation preference $ 18,075
Non-Voting Common Stock [Member]    
Common stock, par value (in dollars per shares) $ 0.001 $ 0.001
Common stock, authorized 3,553 3,553
Common stock, issued 1 1
Common stock, outstanding 1 1