Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net loss	$ (29,256)	$ (25,064)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,651	2,244
Stock-based compensation	3,522	3,164
Change in fair value of contingent consideration related to acquisition	12,700	10,000
Gain on sale of equipment	0	(141)
Changes in operating assets and liabilities:
Accounts receivable	(4,074)	(4,055)
Other receivables	103	407
Inventories	(957)	(7,126)
Prepaid expenses and other current assets	(582)	(668)
Accounts payable	(1,983)	699
Accrued payroll	407	1,929
Accrued expenses and other current liabilities	1,262	1,058
Litigation Settlement, Expense	5,000	0
Deferred rent	(8)	0
Net cash used in operating activities	(12,215)	(17,553)
Cash flows from investing activities:
Purchases of property and equipment	(1,408)	(1,801)
Purchases of patent license	(100)	0
Business acquisition	2,367	0
Net cash used in investing activities	(3,875)	(1,801)
Cash flows from financing activities:
Proceeds from sale of stock under secondary offering, net of expenses	40,069	0
Proceeds from sale of common stock under employee stock purchase plan	1,409	1,053
Proceeds from exercise of stock options	2,355	4,044
Repayments of long-term debt	0	(62)
Net cash provided by financing activities	43,833	5,035
Effect of exchange rate changes on cash and cash equivalents	(38)	0
Net decrease in cash and cash equivalents	27,705	(14,319)
Cash and cash equivalents, beginning of period	20,035	38,191
Cash and cash equivalents, end of period	$ 47,740	$ 23,872