Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net loss	$ (2,238)	$ (3,006)
Adjustments to reconcile net loss from operations to net cash used in operating activities:
Stock-based compensation	36	122
Amortization	6	12
Depreciation	69	186
Net loss on sale of available-for-sale investments	31	1
Changes in assets and liabilities:
Accounts receivable	(17)	66
Accounts payable	(7)	(59)
Other assets and liabilities	(127)	(790)
Net cash used in operating activities	(2,247)	(3,468)
Cash flows from investing activities:
Sale of available-for-sale investments	3,345	889
Maturities of available-for-sale securities	250	500
Purchases of property and equipment	0	(7)
Net cash provided by investing activities	3,595	1,382
Cash flows from financing activities:
Payments for purchase of treasury stock	(1)	(3)
Proceeds from exercise of stock options	7	0
Net cash provided by (used in) financing activities	6	(3)
Net change in cash and cash equivalents	1,354	(2,089)
Cash and cash equivalents at beginning of period	552	2,184
Cash and cash equivalents at end of period	1,906	95
Supplemental disclosures of cash flow information:
Cash paid for interest	0	0
Income taxes paid	$ 0	$ 0