Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
OPERATING ACTIVITIES:
Net loss	$ (28,602,783)	$ (32,988,316)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	408,261	336,105
Amortization of debt discount and debt issuance costs	326,892
Share-based compensation expense	3,196,310	2,396,287
Changes in operating assets and liabilities:
Trade receivables, net	(2,448,016)	(1,781,655)
Inventories, net	(13,496)	(327,494)
Prepaid expenses and other assets	668,530	165,967
Accounts payable	4,624,085	1,909,844
Accrued expenses and other liabilities	1,291,197	1,751,036
Accrued compensation and payroll taxes	(372,204)	515,895
Deferred product revenues, net		(1,652,788)
Deferred royalty revenues	(1,374,832)	(936,629)
Net cash used in operating activities	(22,296,056)	(30,611,748)
INVESTING ACTIVITIES:
Purchase of property and equipment	(279,984)	(789,494)
Purchase of restricted investments and restricted cash and cash equivalents	(3,513)	(53,120)
Net cash used in investing activities	(283,497)	(842,614)
FINANCING ACTIVITIES:
Proceeds from issuances of common stock, net of commissions and offering costs	19,101,955	10,062,996
Proceeds from exercise of stock options and warrants	1,558,618	8,551,165
Net cash provided by financing activities	20,660,573	18,614,161
Net decrease in cash and cash equivalents	(1,918,980)	(12,840,201)
Cash and cash equivalents at beginning of period	69,778,406	79,542,564
Cash and cash equivalents at end of period	67,859,426	66,702,363
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Interest paid	1,342,500
Income taxes paid	3,200	3,200
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Release of restriction on short-term investment	401,550
Purchase of property and equipment in accounts payable and accrued expenses and other liabilities		$ 65,250