CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (10,474)	$ (15,437)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	8,712	10,316
Amortization of inventory step-up in fair value	2,896	4,589
Share-based compensation	3,145	1,835
Deferred tax, net	(284)	1,470
Other non-cash transactions	149	(490)
Changes in operating assets and liabilities:
Accounts receivable, net	130	1,164
Inventories	(2,456)	(3,728)
Prepaid expenses and other assets	2,191	1,027
Accounts payable and accrued liabilities	3,205	908
Deferred revenue	(2,527)	11,035
Other long-term liabilities	(82)	(1,320)
Net cash provided by operating activities	4,605	11,369
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of available-for-sale securities	0	9,364
Proceeds on sale of fixed assets	106	0
Capital expenditures	(1,111)	(1,104)
Purchase of non-marketable investment	0	(200)
Purchase of technology rights	0	(335)
Net cash (used in) provided by investing activities	(1,005)	7,725
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of common stock, net	184	52
Payments of term loan	(3,250)	(3,188)
Repurchase of 3.50% senior convertible notes	0	(3,855)
Net cash used in financing activities	(3,066)	(6,991)
Effect of exchange rate changes on cash and cash equivalents	44	(278)
Net increase in cash and cash equivalents	578	11,825
Cash and cash equivalents at beginning of period	57,128	25,671
Cash and cash equivalents at end of period	$ 57,706	$ 37,496