Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Operating activities:
Net loss	$ (4,642)	$ (5,065)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	301	422
Amortization of premiums on marketable securities	50	138
Stock-based compensation expense	135	313
Non-cash interest expense	70	60
Changes in operating assets and liabilities:
Accounts receivable	(74)	(75)
Prepaid expenses and other current assets	67	(2)
Inventories	219	(139)
Accounts payable and other accrued liabilities	333	223
Accrued compensation	452	(291)
Net cash used in operating activities	(3,089)	(4,416)
Investing activities:
Purchases of property and equipment	(124)	(248)
Proceeds from maturities of investments	7,608	2,500
Purchases of investments	(3,607)	(10,206)
Net cash provided by (cash used) in investing activities	$ 3,877	(7,954)
Financing activities:
Net proceeds from issuances of common stock		(20)
Net increase (decrease) in cash and cash equivalents	$ 788	(12,390)
Cash and cash equivalents at beginning of period	8,264	25,553
Cash and cash equivalents at end of period	9,052	13,163
Supplemental disclosure of cash flow information:
Interest paid	$ 50	50
Supplemental disclosure of non-cash information:
Incremental debt discount relating to note extension		$ 515