Acquisitions (Details) (USD $)	1 Months Ended	3 Months Ended	9 Months Ended		1 Months Ended		1 Months Ended			1 Months Ended
	Jan. 29, 2011 Spectra Linear	Apr. 02, 2011 Spectra Linear	Oct. 01, 2011 Spectra Linear Director Stockholder	Jan. 25, 2011 Spectra Linear	Jan. 29, 2011 Spectra Linear Core and developed technology Y	Jan. 25, 2011 Spectra Linear Core and developed technology	Jan. 29, 2011 Spectra Linear Customer relationships Y	Jan. 25, 2011 Spectra Linear Customer relationships	May 01, 2010 Silicon Clocks, Inc Segment	May 01, 2010 Silicon Clocks, Inc Developed technology Y	May 01, 2010 Silicon Clocks, Inc Customer relationships Y	May 01, 2010 Silicon Clocks, Inc In-process research and development	May 01, 2010 Silicon Clocks, Inc In-process research and development Resonator	May 01, 2010 Silicon Clocks, Inc In-process research and development Clocks
Business acquisition
Estimated fair value of contingent consideration				$ 1,000,000
Contingent consideration potential amount payable				10,000,000
Minimum revenue of the acquired products during 2011, based on which contingent consideration could be payable	16,000,000
Net liabilities assumed				8,000,000
Post combination expenses, additional consideration paid to employees of acquired entity		4,500,000
Consideration paid in cash for acquisition									21,000,000
Portion of cash consideration deposited in escrow				6,000,000					2,000,000
Intangible assets				17,960,000					9,730,000
Finite intangible assets						16,560,000		1,400,000		230,000	30,000
Indefinite intangible assets												9,470,000	5,200,000	4,270,000
Accounts receivable				1,759,000
Inventories				1,199,000
Cash and cash equivalents									514,000
Other current assets				1,658,000					473,000
Goodwill				4,097,000					3,209,000
Deferred tax assets - non-current				12,316,000					11,521,000
Other non-current assets				597,000					322,000
Notes payable - current portion				(4,641,000)
Current liabilities				(3,112,000)					(1,338,000)
Deferred tax liabilities - non-current									(3,406,000)
Non-current liabilities				(3,254,000)
Total purchase price				$ 28,579,000					$ 21,025,000
Weighted-Average Amortization Period (in years)					9.6		10.0			3.0	2.0
Number of directors, general partner with InterWest Partners, principal stockholders of Spectra Linear			1
Number of principal stockholders of acquiree, into which entity's directors are general partners			1
Number of operating segments, to which goodwill, not deductible for tax purposes, is allocated									1
Discount rate applicable to the cash flows (as a percent)												19.00%