Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 6,995	$ 15,595
Accounts receivable	652	545
Inventory	2,315	1,588
Other current assets	205	136
Total current assets	10,167	17,864
Property, plant and equipment, net	576	570
Other assets	195	21
TOTAL ASSETS	10,938	18,455
Current liabilities
Accounts payable and accrued expenses	838	862
Accrued compensation	979	1,021
Other current liabilities	186	208
Total current liabilities	2,003	2,091
Other liabilities	126	126
Total liabilities	2,129	2,217
Commitments and contingencies
Stockholders' equity
Preferred stock	0	0
Common stock as of June 30, 2018 and December 31, 2017, par value $0.0001 per share; authorized 100,000,000 shares, issued and outstanding 4,505,953 and 3,798,929, respectively	0	0
Additional paid-in capital	198,474	197,367
Accumulated other comprehensive income:
Foreign currency translation adjustment	1,226	1,227
Accumulated deficit	(190,891)	(182,356)
Total stockholders' equity	8,809	16,238
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	10,938	18,455
Series A Junior Participating Preferred Stock [Member]
Stockholders' equity
Preferred stock	0	0
Series F Convertible Preferred Stock [Member]
Stockholders' equity
Preferred stock	$ 0	$ 0