Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities
Net loss	$ (36,933)	$ (13,421)	$ (27,236)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation of property and equipment	3,687	3,096	2,945
Amortization of intangible assets	1,342	1,216	1,234
Charges incurred in connection with acquired IPR&D	0	3,353	0
Provision for doubtful accounts	150	0	1,300
Write-off of patent costs	0	0	4,206
Stock-based compensation	17,841	16,230	13,612
Accretion (Amortization) of Discounts and Premiums, Investments	1,240	1,432	(109)
Other	(391)	268	170
Changes in assets and liabilities
Accounts receivable	205	(14,821)	9,503
Inventories	(2,254)	(4,607)	(9,648)
Prepaid expenses and other assets	(1,271)	(1,962)	1,319
Accounts payable	677	2,073	576
Accrued expenses and other liabilities	(6,078)	8,239	(8,906)
Deferred revenue	(2,487)	(1,980)	(1,731)
Net cash used in operating activities	(24,272)	(884)	(12,765)
Cash flows from investing activities
Expenditures for property and equipment	(4,220)	(3,954)	(3,369)
Acquisitions	(1,700)	(3,353)	(5,741)
Purchases of long-term investments	(12,340)	(14,404)	(750)
Purchases of marketable securities	(111,983)	(199,138)	(38,782)
Sales of marketable securities	15,792	6,885	7,290
Maturities of marketable securities	136,612	101,255	33,400
Costs incurred in connection with patents	0	0	(717)
Net cash provided by (used in) investing activities	22,161	(112,709)	(8,669)
Cash flows from financing activities
Proceeds from the employee stock purchase plan	3,042	4,238	4,076
Payment of employee taxes related to vested restricted stock	(5,367)	(4,884)	(6,303)
Exercise of stock options	12	0	0
Proceeds from offering of common stock	0	0	134,979
Principal payments made on financing obligation	(222)	(154)	(92)
Net cash (used in) provided by financing activities	(2,535)	(800)	132,660
Net change in cash and cash equivalents	(4,646)	(114,393)	111,226
Cash and cash equivalents
Beginning of period	71,070	185,463	74,237
End of period	66,424	71,070	185,463
Supplemental cash flow information
Interest paid	$ 1,634	$ 1,649	$ 1,659