Consolidated Statements Of Cash Flows (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Operating activities:
Net loss	$ (60,199)	$ (71,429)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	3,502	1,712
Depreciation and amortization	1,192	1,046
Amortization of debt issuance costs and non-cash interest	1,289	3,763
Change in fair value of warrant liability	(546)	12,833
Change in fair value of embedded derivatives	(137)	0
Loss on disposal and impairment of property and equipment	0	3
Changes in operating assets and liabilities:
Trade accounts receivable	(1,473)	(2,165)
Inventory, net	1,089	(4,438)
Prepaid expenses and other current assets	(181)	(125)
Other assets	213	(5,506)
Accounts payable and accrued expenses	(529)	4,847
Deferred rent	(44)	(26)
Deferred revenue	(8,411)	993
Net cash used in operating activities	(64,235)	(58,492)
Investing activities:
Purchases of property and equipment	(426)	(2,084)
Net cash used in investing activities	(426)	(2,084)
Financing activities:
Net proceeds from borrowing of debt and revolving credit facility	34,353	42,702
Payments on borrowings of debt and revolving credit facility	(6,094)	(15,367)
Proceeds from exercise of common stock options	92	3
Proceeds from issuance of common stock, net of issuance costs	57,985	0
Net cash provided by financing activities	86,336	27,338
Net increase (decrease) in cash and cash equivalents	21,675	(33,238)
Cash and cash equivalents at beginning of period	49,172	44,911
Cash and cash equivalents at end of period	$ 70,847	$ 11,673