Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets
Cash	$ 1,644	$ 3,918
Accounts receivable, net of allowance	94	48
Inventory	232	242
Prepaid expenses and other assets	184	469
Total current assets	2,154	4,677
Operating lease right of use asset	178
Furniture and fixtures, net of depreciation	67	72
Intangible assets, net of amortization	357	392
Total Noncurrent Assets	602	464
Total assets	2,756	5,141
Current liabilities
Accounts payable	955	270
Due to related party	4	28
Accrued expenses	1,063	852
Current portion of operating lease liability	78
Accrued dividends	1,800	1,064
Loan payable	1,260
Total current liabilities	5,160	2,214
Other lease liability, net of current portion	107
Total liabilities	5,267	2,214
Commitments and contingencies (Note 9)
Stockholders' equity (deficit)
Common stock, $0.006 par value; 180,000,000 shares authorized, 10,869,530 and 10,761,684 shares issued and outstanding as of June 30, 2019 and December 31, 2018, respectively	65	65
Additional paid-in capital	29,346	28,710
Accumulated deficit	(31,922)	(25,848)
Total stockholders' equity (deficit)	(2,511)	2,927
Total liabilities and stockholders' equity (deficit)	2,756	5,141
Series C Convertible Preferred Stock [Member]
Stockholders' equity (deficit)
Preferred stock, $0.01 par value; 100,000 shares authorized
Series D Convertible Preferred Stock [Member]
Stockholders' equity (deficit)
Preferred stock, $0.01 par value; 100,000 shares authorized
Series E Convertible Preferred Stock [Member]
Stockholders' equity (deficit)
Preferred stock, $0.01 par value; 100,000 shares authorized
Series F Convertible Preferred Stock [Member]
Stockholders' equity (deficit)
Preferred stock, $0.01 par value; 100,000 shares authorized