CONDENSED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Operating Activities
Net income (loss)	$ 1,512	$ (26,077)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Depreciation and amortization	4,116	1,405
Amortization of investments	(352)	267
Gain on bargain purchase		(92)
Allowance for inventory obsolescence	243	696
Stock-based compensation	4,546	3,822
Contingent consideration fair value adjustment	441	39
Changes in assets and liabilities:
Accounts receivable	(2,389)	(2,347)
Inventories	2,856	(667)
Prepaid and other assets	812	2,384
Accounts payable and other accrued liabilities	(75)	2,270
Accrued compensation	1,083	(129)
Deferred revenue	(2,371)	(6,838)
Net cash provided by (used in) operating activities	10,422	(25,267)
Investing Activities
Purchases of property and equipment	(1,370)	(2,149)
Acquisition of businesses	(4,000)	(26,435)
Acquisition of patents	(150)
Purchases of marketable securities	(24,263)	(29,993)
Maturities of marketable securities	51,988	44,880
Sales of marketable securities	323	40,408
Net cash provided by investing activities	22,528	26,711
Financing Activities
Proceeds from issuance of common stock	2,256	1,885
Net cash provided by financing activities	2,256	1,885
Net increase (decrease) in cash and cash equivalents	35,206	3,329
Cash and cash equivalents at beginning of period	29,076	24,043
Cash and cash equivalents at end of period	$ 64,282	$ 27,372