Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities
Net (loss) income	$ (27,236)	$ (255)	$ 1,712
Adjustments to reconcile net (loss) income to net cash provided by operating activities
Depreciation of property and equipment	2,945	3,150	3,730
Amortization of Intangible Assets	1,234	296	204
Accounts Receivable, Credit Loss Expense (Reversal)	1,300	125	125
Financing Receivable, Allowance for Credit Loss, Recovery			(225)
Write off of Patent Costs	4,206	800	497
Share-based Payment Arrangement, Noncash Expense	13,612	11,266	10,302
Accretion (Amortization) of Discounts and Premiums, Investments	(109)	(55)	0
Loss on disposal of property and equipment and other	170	42	16
Changes in assets and liabilities
Accounts receivable	9,503	(4,915)	(2,878)
Inventories	(9,648)	(1,453)	292
Prepaid expenses and other assets	1,319	(393)	2,308
Accounts payable	576	566	104
Accrued expenses and other liabilities	(8,906)	2,918	(6,577)
Deferred revenue	(1,731)	(1,884)	189
Net cash (used in) provided by operating activities	(12,765)	10,208	9,674
Cash flows from investing activities
Expenditures for property and equipment	(3,369)	(2,665)	(1,956)
Payments To Acquire Intangible Assets Purchased	(5,741)	0	0
Payments to Acquire Marketable Securities	(750)	(3,055)	(2,538)
Payments to Acquire Debt Securities, Available-for-sale	(38,782)	(47,892)	0
Proceeds from Sale and Maturity of Marketable Securities	7,290	150	194
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale	33,400	0	0
Costs incurred in connection with patents	(717)	(890)	(1,113)
Proceeds from convertible note receivable	0	0	318
Net cash used in investing activities	(8,669)	(54,352)	(5,095)
Cash flows from financing activities
Proceeds from the employee stock purchase plan	4,076	3,752	3,242
Payment of employee taxes related to vested restricted stock	(6,303)	(1,791)	0
Exercise of stock options	0	196	513
Proceeds from Issuance of Common Stock	134,979	0	0
Principal payments made on financing obligation	(92)	(36)	14
Net cash provided by financing activities	132,660	2,121	3,769
Net change in cash and cash equivalents	111,226	(42,023)	8,348
Cash and cash equivalents
Beginning of period	74,237	116,260	107,912
End of period	185,463	74,237	116,260
Supplemental cash flow information
Interest paid	$ 1,659	$ 1,684	$ 1,717