Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Document Period End Date	Jun. 30, 2018
Cash flows from operating activities
Net income (loss)	$ 1,712	$ (1,792)	$ (56,024)
Adjustments to reconcile net income (loss) to net cash used in operations
Depreciation of property and equipment	3,730	3,917	3,686
Provision for (recovery of) doubtful accounts (including note receivable)	(225)	465	725
Amortization of patents	204	218	231
Write-off of patent costs	497	733	168
Loss on disposal of property and equipment	16	158	170
Stock-based compensation	10,302	10,354	12,977
Other	0	138	0
Changes in assets and liabilities
Accounts receivable	(2,878)	(5,809)	7,327
Inventories	292	543	(3,474)
Prepaid expenses and other assets	2,308	(1,823)	728
Accounts payable	104	1,761	(970)
Accrued expenses and other liabilities	(6,577)	725	10,873
Deferred revenue	189	10,000	0
Net cash provided by (used in) operating activities	9,674	19,588	(23,583)
Cash flows from investing activities
Expenditures for property and equipment	(1,956)	(981)	(3,818)
Purchase of investment	(2,538)	0	0
Proceeds from (issuance of) convertible note receivable	318
Proceeds from (issuance of) convertible note receivable		0	(350)
Purchases of marketable securities	0	0	(37)
Sales of marketable securities	194	46	1,249
Costs incurred in connection with patents	(1,113)	(844)	(813)
Net cash used in investing activities	(5,095)	(1,779)	(3,769)
Cash flows from financing activities
Proceeds from the employee stock purchase plan	3,242	3,254	3,142
Exercise of stock options	513	5,263	1,006
Proceeds from financing		20,944	0
Other	14	4	0
Net cash provided by financing activities	3,769	29,465	4,148
Net change in cash and cash equivalents	8,348	47,274	(23,204)
Cash and cash equivalents
Beginning of period	107,912	60,638	83,842
End of period	116,260	107,912	60,638
Noncash investing and financing activities
Change in equipment included in accounts payable	162	(319)	(374)
Change in patent costs included in accounts payable	237	(150)	87
Supplemental cash flow information
Interest paid	$ 1,717	$ 500	$ 0