BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash	$ 4,791	$ 2,101
Investment in securities	2,448	5,023
Accounts receivable	52	16
Prepaid expenses	336	170
Inventory	1,118	540
Deposits	12	19
Total current assets	8,757	7,869
Property and equipment, net	1,171	1,454
Total assets	9,928	9,323
Current liabilities:
Short-term debt	235	177
Accounts payable	206	391
Accrued expenses	531	589
Notes payable, related parties	0	12
Total current liabilities	972	1,169
Long-term debt, net	296	591
Deferred rent	23	41
Total liabilities	1,291	1,801
Commitments and contingencies (See note 14)
Stockholders' equity:
Common stock, $0.001 par value, 100,000,000 shares authorized, 23,425,237 and 16,404,195 shares issued and outstanding at September 30, 2018 and December 31, 2017, respectively	23	16
Additional paid-in capital	91,822	81,103
Accumulated deficit	(83,208)	(73,597)
Total stockholders' equity	8,637	7,522
Total liabilities and stockholders' equity	$ 9,928	$ 9,323