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Share-Based Compensation (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based compensation expenses	$ 1,936	$ 4,190	$ 6,311
Restricted Stock Units (Rsus) [Member]
Share-based compensation expenses	8,195	6,773	11,485
Cost of Revenues [Member]
Share-based compensation expenses	176	124	240
Cost of Revenues [Member] | Restricted Stock Units (Rsus) [Member]
Share-based compensation expenses	176	124	240
Research and Development [Member]
Share-based compensation expenses	5,625	5,062	8,803
Research and Development [Member] | Restricted Stock Units (Rsus) [Member]
Share-based compensation expenses	5,605	4,790	8,153
General and administrative [Member]
Share-based compensation expenses	1,191	872	1,525
General and administrative [Member] | Restricted Stock Units (Rsus) [Member]
Share-based compensation expenses	1,184	863	1,505
Selling and Marketing Expense [Member]
Share-based compensation expenses	1,230	1,005	1,613
Selling and Marketing Expense [Member] | Restricted Stock Units (Rsus) [Member]
Share-based compensation expenses	1,230	996	1,587
Income Tax Benefit [Member]
Share-based compensation expenses	1,886	818	2,127
Income Tax Benefit [Member] | Restricted Stock Units (Rsus) [Member]
Share-based compensation expenses	$ 1,886	$ 818	$ 2,127

X

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration