Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities
Net loss	$ (35,290)	$ (24,037)	$ (16,790)
Adjustments to reconcile net loss to net cash used in operations
Depreciation of property and equipment	1,243	903	817
Provision for doubtful accounts	65	195	60
Amortization of patents	124	70	55
Write-off of patent costs	64	130	162
Amortization of (premium) discount on debt, net	137	(59)	(68)
Debt conversion and valuation of conversion options, net	716	181	736
Stock-based compensation	10,928	7,442	5,165
Other	0	0	260
Changes in assets and liabilities
Accounts receivable	(6,718)	(1,281)	(391)
Inventories	(6,647)	818	(1,243)
Prepaid expenses and other assets	(564)	925	(379)
Accounts payable	4,624	1,484	269
Accrued expenses and other liabilities	4,480	2,464	7
Net cash used in operations	(26,838)	(10,765)	(11,340)
Cash flows from investing activities
Expenditures for property and equipment	(12,717)	(1,672)	(437)
Patent acquisition costs	(702)	(783)	(538)
Net cash used in investing activities	(13,419)	(2,455)	(975)
Cash flows from financing activities
Proceeds from the employee stock purchase plan	3,371	1,752	1,418
Exercise of stock options and warrants	16,262	5,927	4,428
Proceeds from borrowings	4,800	4,500	7,885
Payments on borrowings	(9,850)	(4,800)	(1,935)
Proceeds from sale of common stock, net of issuance costs	84,369	38,209	14,889
Net cash provided by financing activities	98,952	45,588	26,685
Net change in cash and cash equivalents	58,695	32,368	14,370
Cash and cash equivalents
Beginning of period	67,897	35,529	21,159
End of period	126,592	67,897	35,529
Noncash investing and financing activities
Issuance and expiration of common stock warrants	92	0	497
Beneficial conversion feature on convertible debt	0	108	28
Equipment included in accounts payable	825	66	160
Patent costs included in accounts payable	90	43	0
Conversion of convertible debt	5,252	4,900	600
Net exercise of common stock warrants	4,322	1,130	335
Premium on convertible debt	0	304	267
Supplemental cash flow information
Interest paid	$ 534	$ 1,132	$ 1,383