Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net loss	$ (5,792)	$ (8,998)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	205	387
Amortization	6	19
Depreciation	200	576
Deferred income tax benefit	(429)	0
Net loss on sale of available-for-sale investments	31	76
Changes in assets and liabilities:
Accounts receivable	(29)	142
Income tax receivable	(429)	0
Accounts payable	27	(135)
Other assets and liabilities	(340)	(708)
Net cash used in operating activities	(6,550)	(8,641)
Cash flows from investing activities:
Sale of available-for-sale investments	3,345	5,458
Maturities of available-for-sale securities	250	1,649
Sale of property and equipment	2	0
Purchases of property and equipment	0	(14)
Net cash provided by investing activities	3,597	7,093
Cash flows from financing activities:
Payments for purchase of treasury stock	(1)	(3)
Proceeds from exercise of stock options	7	0
Proceeds from issuance of common stock, net of offering costs	3,919	0
Net cash provided by (used in) financing activities	3,925	(3)
Net change in cash and cash equivalents	972	(1,551)
Cash and cash equivalents at beginning of period	552	2,184
Cash and cash equivalents at end of period	1,524	633
Supplemental disclosures of cash flow information:
Cash paid for interest	0	0
Income taxes paid	$ 0	$ 0