CONDENSED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 5,363	$ 11,826
Investment in securities held to maturity	2,961	0
Accounts receivable	6	10
Prepaid expenses	247	337
Inventory	111	57
Deposits	205	9
Total current assets	8,893	12,239
Property and equipment, net	702	631
Total assets	9,595	12,870
Current liabilities:
Short-term debt	50	45
Accounts payable	185	351
Accrued contract cancellation settlement	0	1,000
Accrued expenses	662	371
Notes payable, related parties	26	30
Total current liabilities	923	1,797
Notes payable, related parties	0	6
Long-term debt, net	141	138
Common stock warrant liability	60	69
Deferred rent	38	33
Total liabilities	1,162	2,043
Stockholders' equity:
Common stock, $0.001 par value, 100,000,000 shares authorized, 10,161,042 and 10,157,292 shares issued and outstanding at March 31, 2017 and December 31, 2016, respectively	10	10
Additional paid-in capital	72,826	72,069
Stock subscribed, but not issued, consisting of 44,750 and 4,750 shares at March 31, 2017 and December 31, 2016, respectively	363	59
Accumulated deficit	(64,766)	(61,311)
Total stockholders' equity	8,433	10,827
Total liabilities and stockholders' equity	$ 9,595	$ 12,870