CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (9,975)	$ (7,174)
Adjustments to reconcile net loss to net cash used in operating activities:
Gain on investments held to maturity	(20)
Amortization of discounts on investments held to maturity	11
Depreciation and amortization	273	143
Stock-based compensation	2,818	2,406
Non-cash charge for settlement of dispute		300
Amortization of debt discount		27
Gain on remeasurement of common stock warrant liability	(65)	(51)
Loss on extinguishment of unsecured promissory note		171
(Increase) decrease in current assets:
Accounts receivable	3	(4)
Prepaid expenses	165	(17)
Inventory	(337)
Deposits	(8)
Increase (decrease) in current liabilities:
Accounts payable	(176)	77
Accrued contract cancellation settlement	(1,000)
Accrued expenses	703	61
Deferred rent	12	(4)
Deferred revenues		(175)
Net cash used in operating activities	(7,596)	(4,240)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of securities held to maturity	(2,940)
Purchase of property and equipment	(885)	(54)
Net cash used in investing activities	(3,825)	(54)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of series B convertible preferred stock		896
Proceeds from the issuance of common stock		6,199
Proceeds from the issuance of convertible notes payable		326
Repayments of convertible notes payable		(810)
Proceeds from the issuance of notes payable	437
Repayments of notes payable	(48)	(24)
Repayments of notes payable, related parties	(18)	(721)
Repayments of capital lease obligations	(77)	(16)
Payment of deferred offering costs		(801)
Proceeds from exercise of stock options and warrants		449
Net cash provided by financing activities	294	5,498
NET CHANGE IN CASH	(11,127)	1,204
CASH AT BEGINNING OF PERIOD	11,826	141
CASH AT END OF PERIOD	699	1,345
SUPPLEMENTAL INFORMATION:
Interest paid	55	23
Income taxes paid
NON-CASH INVESTING AND FINANCING ACTIVITIES:
Purchases of equipment under capital lease obligations	316	157
Original issue discount		147
Debt discount on convertible notes		9
Related party convertible note extinguished for settlement payable		404
Contributed capital, debt forgiveness by related parties		2,003
Issuance of series B convertible preferred stock in connection with conversion of convertible notes and		16
Issuance of shares of common stock upon conversion of Series B convertible preferred stock		260
Dividends		$ 90