Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash flows from operating activities:
Net loss	$ (102,027)	$ (73,109)	$ (90,853)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	392	418	471
Accretion of discount on Convertible Notes	5,722
Change in valuation of warrant liability		16,807	11,678
Amortization of deferred financing costs	620
Amortization of restricted stock awards	3,317	4,374	2,661
Stock compensation expense	4,583	3,410	4,065
Net realized gains from sale of investments			(182)
Foreign exchange loss on intercompany loan	9
Deferred income taxes	(22,717)
Changes in:
Accounts receivable, net	(3,828)	(557)	470
Inventories, net	(7,784)	(2,555)	1,307
Recoverable income taxes		2,006	3,520
Prepaid expenses and other current assets	(1,079)	(1,013)	1,380
Other long-term assets	4	11	10
Accounts payable	5,445	(6,314)	2,027
Accrued interest on Convertible Notes	4,643
Other current liabilities	1,939	3,550	(4,612)
Deferred revenues	(14)	355	(378)
Other liabilities	(6,061)	250	(1,199)
Net cash used in operating activities	(116,836)	(52,367)	(69,635)
Cash flows from investing activities:
Proceeds from maturities of held-to-maturity securities	30,413	13,348
Purchases of held-to-maturity securities	(66,038)	(33,417)
Capital expenditures	(416)	(234)	(71)
Changes in restricted cash	(1,300)
Proceeds from sale of available-for-sale securities (restricted)			4,170
Purchases of available-for-sale securities (restricted)			(25)
Net cash (used in) provided by investing activities	(37,341)	(20,303)	4,074
Cash flows from financing activities:
Proceeds from warrant exercises		8,501
Proceeds from issuance of common stock	803	2,130	7,099
Proceeds from issuance of Convertible Notes, net of expenses	222,697
Proceeds from issuance of common stock for cash on registered direct offering, net of expenses			29,019
Proceeds from issuance of common stock for cash on underwritten public offering, net of expenses			61,366
Repurchase and retirement of common stock		(1,282)
Changes in other long-term liabilities	(35)	(60)	(66)
Net cash provided by financing activities	223,465	9,289	97,418
Effect of exchange rate changes	15
Net increase (decrease) in cash and cash equivalents	69,303	(63,381)	31,857
Cash and cash equivalents at beginning of period	44,791	108,172	76,315
Cash and cash equivalents at end of period	114,094	44,791	108,172
Other information:
Income tax paid			1,237
Interest paid	5,395	79	365
Reclassification from warrant liability to APIC on exercise of warrants		$ 41,046