Fair Value Measurements (Tables)

6 Months Ended

Jul. 31, 2014

Fair Value Hierarchy for Financial Assets Measured at Fair Value on Recurring Basis

The following table presents the fair value hierarchy for financial assets measured at fair value on a recurring basis as of July 31, 2014 (in thousands):

	Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market funds	$	42,995	$	—	$	—	$	42,995
Commercial paper		—		2,600		—		2,600
U.S. agency obligations		—		17,984		—		17,984
Short-term investments:
Asset backed-securities		—		3,695		—		3,695
Commercial paper		—		4,999		—		4,999
Corporate notes and bonds		—		33,516		—		33,516
U.S. agency obligations		—		135,983		—		135,983
U.S. treasury securities		—		31,893		—		31,893
Total	$	42,995	$	230,670	$	—	$	273,665

The following table presents the fair value hierarchy for financial assets measured at fair value on a recurring basis as of January 31, 2014 (in thousands):

	Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market funds	$	170,235	$	—	$	—	$	170,235
Commercial paper		—		9,999		—		9,999
U.S. treasury securities		—		33,153		—		33,153
Short-term investments:
Corporate notes and bonds		—		10,507		—		10,507
U.S. agency obligations		—		15,118		—		15,118
Total	$	170,235	$	68,777	$	—	$	239,012