Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities
Net loss	$ (1,792)	$ (56,024)	$ (32,822)
Adjustments to reconcile net loss to net cash used in operations
Depreciation of property and equipment	3,917	3,686	2,150
Provision for doubtful accounts (including note receivable)	465	725	1,121
Amortization of patents	218	231	171
Write-off of patent costs	733	168	43
Loss on disposal of property and equipment	158	170	121
Stock-based compensation	10,354	12,977	14,718
Other	138	0	0
Changes in assets and liabilities
Accounts receivable	(5,809)	7,327	(10,568)
Inventories	543	(3,474)	(1,076)
Prepaid expenses and other assets	(1,823)	728	(1,183)
Accounts payable	1,761	(970)	581
Accrued expenses and other liabilities	725	10,873	4,387
Deferred revenue	10,000	0	0
Net cash provided by (used in) operations	19,588	(23,583)	(22,357)
Cash flows from investing activities
Expenditures for property and equipment	(981)	(3,818)	(20,325)
Issuance of convertible note receivable	0	(350)	0
Purchases of marketable securities	0	(37)	(2,112)
Sales of marketable securities	46	1,249	365
Costs incurred in connection with patents	(844)	(813)	(955)
Net cash used in investing activities	(1,779)	(3,769)	(23,027)
Cash flows from financing activities
Proceeds from the employee stock purchase plan	3,254	3,142	2,882
Exercise of stock options	5,263	1,006	2,152
Payments on borrowings	0	0	(2,400)
Proceeds from financing	20,944	0	0
Other	4	0	0
Net cash provided by financing activities	29,465	4,148	2,634
Net change in cash and cash equivalents	47,274	(23,204)	(42,750)
Cash and cash equivalents
Beginning of period	60,638	83,842	126,592
End of period	107,912	60,638	83,842
Noncash investing and financing activities
Change in equipment included in accounts payable	(319)	(374)	(469)
Change in patent costs included in accounts payable	(150)	87	(52)
Supplemental cash flow information
Interest paid	$ 500	$ 0	$ 23