Condensed Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Operating Activities
Net income (loss)	$ (24,582)	$ 93,138
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Depreciation and amortization	320	197
Amortization of Investments	484	(74)
Gain on bargain purchase	(92)
Allowance for inventory obsolescence	696
Stock-based compensation	2,541	1,867
Changes in assets and liabilities:
Accounts receivable	1,667	(1,597)
Inventories	(902)	(3,443)
Prepaid and other assets	(1,107)	(1,572)
Accounts payable and other accrued liabilities	2,545	4,074
Accrued compensation	(738)	729
Deferred revenue	(5,697)	(11,235)
Net cash provided by (used in) operating activities	(24,865)	82,084
Investing Activities
Purchases of property and equipment	(502)	(444)
Acquisition of Businesses	(26,436)
Purchases of marketable securities	(28,463)	(94,777)
Maturities of marketable securities	38,737	21,399
Sales of marketable securities	29,566
Net cash provided by (used in) investing activities	12,902	(73,822)
Financing Activities
Principal payments on long-term debt		(2,098)
Proceeds from issuance of common stock	1,441	7,621
Net cash provided by (used in) financing activities	1,441	5,523
Net increase (decrease) in cash and cash equivalents	(10,522)	13,785
Cash and cash equivalents at beginning of period	24,043	22,526
Cash and cash equivalents at end of period	$ 13,521	$ 36,311