Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 7,402	$ 5,480
Accounts receivable	932	786
Inventory	1,690	1,658
Other current assets	278	203
Total current assets	10,302	8,127
Property, plant and equipment, net	574	536
Operating lease right-of-use asset	531	0
Other assets	21	113
TOTAL ASSETS	11,428	8,776
Current liabilities
Accounts payable	1,178	1,133
Accrued compensation	1,186	1,498
Current portion of operating lease liability	176	0
Other current liabilities	97	209
Total current liabilities	2,637	2,840
Operating lease liability	357	0
Total liabilities	2,994	2,840
Commitments and contingencies
Stockholders' equity
Preferred stock	0	0
Common stock as of June 30, 2019 and December 31, 2018, par value $0.0001 per share; authorized 100,000,000 shares, issued and outstanding 2,328,320 and 513,445, respectively	0	0
Additional paid-in capital	215,761	204,101
Accumulated other comprehensive income:
Foreign currency translation adjustment	1,218	1,223
Accumulated deficit	(208,545)	(199,388)
Total stockholders' equity	8,434	5,936
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	11,428	8,776
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
Series G Convertible Preferred Stock [Member]
Stockholders' equity
Preferred stock	$ 0	$ 0