Fair Value Measurement (Tables)

9 Months Ended

Sep. 30, 2012

Fair Value Measurement [Abstract]

Schedule of Fair Value Measured on a Recurring Basis

Description	September 30, 2012		Level I		Level II		Level III
Assets:
Marketable securities:
Certificates of deposits	$	1,959	$	—	$	1,959	$	—
Foreign government bond		579		—		579		—
Corporate bonds		49,430		—		49,430		—
Foreign exchange contracts		26		—		26		—
Total assets		51,994		—		51,994		—
Liabilities:
Foreign exchange contracts		34		—		34		—
Total liabilities		34		—		34		—
Description	December 31, 2011		Level I		Level II		Level III
Assets:
Marketable securities:
Certificates of deposits	$	2,204	$	—	$	2,204	$	—
Foreign government bond		589		—		589		—
Corporate bonds		66,234		—		66,234		—
Total assets		69,027		—		69,027		—
Liabilities:
Foreign exchange contracts		225		—		225		—
Total liabilities		225		—		225		—