Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
ASSETS
Cash and cash equivalents	$ 6,937	$ 3,183
Accounts receivable, net of allowance for doubtful accounts ($51 and $10 at December 31, 2019 and December 31, 2018, respectively)	1,066	3,385
Inventory, net of allowance for excess and obsolete inventory and lower of cost or estimated net realizable value adjustments ($247 and $104 at December 31, 2019 and December 31, 2018, respectively)	492	280
Prepaid expenses and other current assets	886	1,760
Total current assets	9,381	8,608
Operating lease right-of-use assets	1,252
Property and equipment, net	110	201
Other assets	477	552
TOTAL ASSETS	11,220	9,361
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	331	551
Accrued liabilities	1,778	3,255
Deferred revenue		41
Operating lease liability	930
Notes payable, related party	1,202
Convertible note	1,409
Embedded derivative liability	3
Warrant liability	34
Total current liabilities	5,687	3,847
Operating lease liabilities-non-current	505
Deferred rent		184
Warrant liability	4,055	178
Other liabilities		198
Total liabilities	10,247	4,407
Stockholders' equity:
Preferred stock: 5,000 shares authorized; none outstanding at December 31, 2019 and December 31, 2018
Common stock, $0.01 par value; 50,000 shares authorized; 27,938 and 17,089 shares issued and outstanding at December 31, 2019 and December 31, 2018, respectively	279	171
Additional paid-in capital	125,718	119,764
Accumulated deficit	(125,024)	(114,981)
Total stockholders' equity	973	4,954
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 11,220	$ 9,361