CONDENSED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash	$ 2,946	$ 4,920
Accounts receivable	150	139
Prepaid expenses	345	342
Inventory	1,335	1,261
Deposits	8	9
Total current assets	4,784	6,671
Right to use asset-operating leases	76
Property and equipment, net	983	1,083
Total assets	5,843	7,754
Current liabilities:
Short-term debt	202	219
Accounts payable	272	173
Accrued expenses	776	771
Total current liabilities	1,250	1,163
Long-term debt, net	227	261
Operating lease liability	76
Common stock warrant liability	5
Deferred rent	15	16
Total liabilities	1,573	1,440
Commitments and contingencies (See note 12)
Stockholders' equity:
Common stock, $0.001 par value, 100,000,000 shares authorized, 23,560,864 and 23,471,999 shares issued and outstanding at March 31, 2019 and December 31, 2018, respectively	24	24
Additional paid-in capital	92,448	92,128
Accumulated deficit	(88,202)	(85,838)
Total stockholders' equity	4,270	6,314
Total liabilities and stockholders' equity	$ 5,843	$ 7,754