Fair Value of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2012

Fair Value of Financial Instruments [Abstract]

Assets and liabilities subject to fair value measurements on a recurring basis

	As of September 30, 2012
	Level I		Level II		Level III		Fair Value
Financial Assets:
Cash and cash equivalents:
Bank deposits	$	—	$	12,519	$	—	$	12,519
Commercial paper		—		16,997		—		16,997
Money market funds		3,186		—		—		3,186
Short-term investments:
Corporate debt obligations		—		20,877		—		20,877
Bank deposits		—		10,063		—		10,063
Commercial paper		—		9,520		—		9,520
US agency securities		—		2,002		—		2,002
Mutual funds		2,750		—		—		2,750
Prepaid expenses and other current assets - Forward foreign exchange contracts		—		269		—		269
Total financial assets	$	5,936	$	72,247	$	—	$	78,183
Financial Liability -
Accrued and other current liabilities - Forward foreign exchange contracts	$	—	$	350	$	—	$	350

	As of December 31, 2011
	Level I		Level II		Level III		Fair Value
Financial Assets:
Cash and cash equivalents:
Bank deposits	$	—	$	20,000	$	—	$	20,000
Money market funds		50,002		—		—		50,002
Short-term investments - Mutual funds		1,587		—		—		1,587
Total financial assets	$	51,589	$	20,000	$	—	$	71,589
Financial Liability -
Accrued and other current liabilities - Forward foreign exchange contracts	$	—	$	631	$	—	$	631