Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
ASSETS
Cash and cash equivalents	$ 9,020	$ 3,183
Accounts receivable, net of allowance for doubtful accounts ($24 and $10 at September 30, 2019 and December 31, 2018, respectively)	1,505	3,385
Inventory, net of allowance for excess and obsolete inventory and lower of cost or estimated net realizable value adjustments ($135 and $104 at September 30, 2019 and December 31, 2018, respectively)	838	280
Prepaid expenses and other current assets	1,135	1,760
Total current assets	12,498	8,608
Operating lease right-of-use assets	1,435
Property and equipment, net	128	201
Other assets	542	552
TOTAL ASSETS	14,603	9,361
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	503	551
Accrued liabilities	1,642	3,255
Deferred revenue		41
Operating lease liability	1,058
Notes payable, related party	1,155
Convertible note	1,890
Embedded derivative liability	4
Total current liabilities	6,252	3,847
Operating lease liabilities-non-current	627
Deferred rent		184
Warrant liability	3,902	178
Other liabilities	315	198
Total liabilities	11,096	4,407
Series A non-voting convertible preferred stock, $0.01 par value; 2,700 shares authorized; 2,700 and 0 shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively	584
Stockholders' equity :
Common stock, $0.01 par value; 50,000 shares authorized; 25,202 and 17,089 shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively	252	171
Additional paid-in capital	125,009	119,764
Accumulated deficit	(122,338)	(114,981)
Total stockholders' equity	2,923	4,954
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 14,603	$ 9,361