Fair Value Measurements (Tables)

9 Months Ended

Oct. 31, 2015

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 October 31, 2015 (in thousands):

	Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market funds	$	25,676	$	—	$	—	$	25,676
Short-term investments
Asset-backed securities		—		6,336		—		6,336
Commercial paper		—		6,597		—		6,597
Corporate notes and bonds		—		37,449		—		37,449
U.S. agency obligations		—		157,441		—		157,441
U.S. treasury securities		—		23,051		—		23,051
Total	$	25,676	$	230,874	$	—	$	256,550

The following table presents the fair value hierarchy for financial assets measured at fair value on a recurring basis as of January 31, 2015 (in thousands):

	Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market funds	$	41,861	$	—	$	—	$	41,861
U.S. agency obligations		—		3,595		—		3,595
Short-term investments
Asset-backed securities		—		9,319		—		9,319
Commercial paper		—		3,394		—		3,394
Corporate notes and bonds		—		45,989		—		45,989
U.S. agency obligations		—		199,911		—		199,911
U.S. treasury securities		—		10,007		—		10,007
Total	$	41,861	$	272,215	$	—	$	314,076