Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (12,959)	$ (18,845)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation of property, plant and equipment	1,567	980
Amortization of intangible assets	121	38
Share-based compensation expense	4,448	3,714
Amortization of premium on investments	112	290
Amortization of discount on convertible senior notes	1,626	1,442
Amortization of deferred financing costs	87	77
Other	(18)	64
Change in operating assets and liabilities:
Accounts receivable	(7,406)	(3,485)
Inventories, net	1,308	(2,733)
Prepaid expenses and other current assets	(785)	(17)
Accounts payable	960	2,261
Accrued interest on convertible senior notes	1,258	1,258
Other accrued liabilities	(5,986)	(1,102)
Other long-term liabilities	(14)	165
Net cash used in operating activities	(15,681)	(15,893)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of investments	(4,256)	(15,000)
Maturities of investments	980	36,590
Additions to property, plant and equipment, net	(899)	(1,463)
Additions to patents	(168)	(63)
Cash paid for security deposits		(750)
Net cash used in investing activities	(4,343)	19,314
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from issuance of common stock	149,126
Payment of common stock issuance costs	(8,131)
Proceeds from exercise of stock options	888	392
Net cash provided by financing activities	141,883	392
Effect of exchange rate changes on cash and cash equivalents	1,098	(674)
INCREASE IN CASH AND CASH EQUIVALENTS	122,957	3,139
CASH AND CASH EQUIVALENTS - BEGINNING OF PERIOD	85,921	71,257
CASH AND CASH EQUIVALENTS - END OF PERIOD	$ 208,878	$ 74,396