CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities
Net loss	$ (5,184)	$ (7,122)
Adjustments to reconcile net loss to net cash flows used in operating activities:
Share-based compensation expense	665	3,183
Depreciation	224	226
Change in fair value of warrant liability	(210)	0
Changes in operating assets and liabilities:
Related party receivables, net	0	66
Accounts receivable	(19)	(76)
Inventories	28	6
Prepaid expenses	174	144
Accounts payable	230	(83)
Accrued and other current liabilities	108	(54)
Net cash used in operating activities	(3,984)	(3,710)
Cash flows from investing activities
Additions to property and equipment	(217)	(21)
Net cash used in investing activities	(217)	(21)
Cash flows from financing activities
Proceeds from issuance of common stock and warrants, net of issuance costs	4,496	0
Proceeds from issuance of common stock, net of issuance costs	349	3,237
Proceeds from issuance of convertible preferred stock, net of issuance costs	0	5,357
Net cash provided by financing activities	4,845	8,594
Effect of foreign exchange rates on cash	0	(8)
Net increase in cash	644	4,855
Cash at beginning of period	7,456	5,272
Cash at end of period	8,100	10,127
Supplemental disclosure of cash flow information and non-cash investing and financing activities:
Equipment purchases included in accounts payable	9	0
Fair Value Of Warrants Issued To Placement Agent	$ 116	$ 0