Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net loss	$ (7,534)	$ (13,251)
Adjustments to reconcile net loss from operations to net cash used in operating activities:
Stock-based compensation	305	450
Amortization	6	16
Depreciation	262	749
Deferred income tax benefit	(429)	0
Net loss on sale of available-for-sale investments	31	124
Loss on impairment of long-lived assets	0	1,693
Changes in assets and liabilities:
Accounts receivable	9	134
Inventory, net	(324)	0
Income tax receivable	(429)	0
Other assets and liabilities	(420)	(552)
Accounts payable	48	(147)
Net cash used in operating activities	(8,475)	(10,784)
Cash flows from investing activities:
Proceeds from sale of available-for-sale investments	3,345	7,229
Proceeds from maturities of securities	250	1,949
Proceeds from sale of property and equipment	2	0
Purchases of property and equipment	0	(19)
Net cash provided by investing activities	3,597	9,159
Cash flows from financing activities:
Payments for purchase of treasury stock	(1)	(7)
Proceeds from exercise of stock options	7	0
Proceeds from issuance of stock, net of offering issuance costs	5,908	0
Net cash provided by (used in) financing activities	5,914	(7)
Net change in cash and cash equivalents	1,036	(1,632)
Cash and cash equivalents at beginning of period	552	2,184
Cash and cash equivalents at end of period	1,588	552
Supplemental disclosures of cash flow information:
Cash paid for interest	0	0
Income taxes paid	$ 0	$ 0