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Balance Sheet Details (Tables)

3 Months Ended

Mar. 31, 2013

Balance Sheet Details [Abstract]

Summary of marketable securities available-for-sale

March 31, 2013		Maturity in Years				Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Estimated Fair Value
Available-for-sale:
Government agency securities			1 or less			$	4,272			$	0			$	0			$	4,272
Municipal bonds			1 or less				11,377				10				0				11,387
Certificates of deposit			1 or less				4,999				0				0				4,999
Corporate debentures / bonds			1 or less				9,334				3				0				9,337
Total short-term marketable securities							29,982				13				0				29,995
Available-for-sale:
Municipal bonds			1 to 2				1,668				2				0				1,670
Certificates of deposit			1 to 2				1,920				0				0				1,920
Corporate debentures / bonds			1 to 2				6,279				0				(7	)			6,272
Total long-term marketable securities							9,867				2				(7	)			9,862
						$	39,849			$	15			$	(7	)		$	39,857
December 31, 2012		Maturity in Years				Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Estimated Fair Value
Available-for-sale:
Government agency securities			1 or less			$	3,265			$	1			$	0			$	3,266
Municipal bonds			1 or less				11,246				14				0				11,260
Certificates of deposit			1 or less				6,200				5				0				6,205
Corporate debentures / bonds			1 or less				17,330				3				0				17,333
Total short-term marketable securities							38,041				23				0				38,064
Available-for-sale:
Certificates of deposit			1 to 2				1,200				1				0				1,201
Total long-term marketable securities							1,200				1				0				1,201
						$	39,241			$	24			$	0			$	39,265

Summary of inventories

		March 31, 2013				December 31, 2012
Finished goods		$	21,516			$	26,776
Raw materials and components			8,674				12,240
		$	30,190			$	39,016

Summary of accrued Expenses

		March 31, 2013				December 31, 2012
Royalties		$	5,002			$	4,349
Payroll and related expenses			8,250				7,788
Product warranty			2,664				2,329
Market development funds and price protection			2,176				2,147
Deferred rent			667				573
Professional fees			1,738				1,549
Deferred revenue			4,025				4,630
Other			3,712				4,435
		$	28,234			$	27,800

Summary of accrued warranty obligations

		Three Months Ended March 31, 2013				Three Months Ended March 31, 2012
Warranty liability at beginning of period		$	2,329			$	1,525
Additions charged to operations			2,256				1,267
Deductions from liability			(1,921	)			(1,054	)
Warranty liability at end of period		$	2,664			$	1,738

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