Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net loss	$ (8,998)	$ (8,968)
Adjustments to reconcile net loss from operations to net cash used in operating activities:
Stock-based compensation	387	1,035
Amortization	19	25
Depreciation	576	524
Net loss on sale of available-for-sale investments	76	60
Changes in assets and liabilities:
Accounts receivable	142	(27)
Cost, estimated earnings and billings, net on uncompleted contracts	0	451
Accounts payable	(135)	36
Other assets and liabilities	(708)	407
Net cash used in operating activities	(8,641)	(6,457)
Cash flows from investing activities:
Sale of available-for-sale investments	5,458	3,744
Maturities of available-for-sale securities	1,649	4,536
Purchases of property and equipment	(14)	(486)
Net cash provided by investing activities	7,093	7,794
Cash flows from financing activities:
Payments for purchase of treasury stock	(3)	(1,283)
Net cash used in financing activities	(3)	(1,283)
Net change in cash and cash equivalents	(1,551)	54
Cash and cash equivalents at beginning of period	2,184	4,399
Cash and cash equivalents at end of period	633	4,453
Supplemental disclosures of cash flow information:
Cash paid for interest	0	0
Income taxes paid	$ 0	$ 0