Fair Value Measurements

12 Months Ended

Jan. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

The Company measures its financial assets at fair value each reporting period using a fair value hierarchy that prioritizes the use of observable inputs and minimizes the use of unobservable inputs when measuring fair value. A financial instrument’s classification within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement.

Three levels of inputs maybe used to measure as follows:

Level 1-Valuations based on observable inputs that reflect quoted prices for identical assets or liabilities in active markets.

Level 2-Valuations based on other inputs that are directly or indirectly observable in the marketplace.

Level 3-Valuations based on unobservable inputs that are supported by little or no market activity.

Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following table presents information about the Company’s financial assets that are measured at fair value on a recurring basis using the above input categories (in thousands):

	As of January 31, 2018
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	90,770	$	—	$	—	$	90,770
Total cash equivalents	$	90,770	$	—	$	—	$	90,770
Short-term investments:
Commercial paper	$	—	$	15,946	$	—	$	15,946
U.S. treasury securities	—		61,738		—		61,738
Corporate debt securities	—		24,081		—		24,081
Total short-term investments	—		101,765		—		101,765
Total cash equivalents and short-term investments	$	90,770	$	101,765	$	—	$	192,535

	As of January 31, 2017
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	10,565	$	—	$	—	$	10,565
Total cash equivalents	$	10,565	$	—	$	—	$	10,565
Short-term investments:
Asset-backed securities	$	—	$	1,538	$	—	$	1,538
Corporate debt securities	—		12,852		—		12,852
Total short-term investments	—		14,390		—		14,390
Total cash equivalents and short-term investments	$	10,565	$	14,390	$	—	$	24,955
Liabilities:
Series B redeemable convertible preferred stock warrant	$	—	$	—	$	304	$	304

During the three months ended April 30, 2017, the Series B redeemable convertible preferred stock warrant liability that was outstanding as of January 31, 2017 was exercised. The corresponding warrant liability was remeasured to fair value based upon the value of the underlying common stock issued at the IPO and reclassified to additional paid-in capital. The expense resulting from remeasurement was recognized in other income (expense), net in the consolidated statements of operations.

The change in the fair value of the Series B redeemable convertible preferred stock warrant was as follows (in thousands):

Balance at January 31, 2016	$	237
Increase in fair value of warrant	67
Balance at January 31, 2017	304
Increase in fair value of warrant	104
Reclassification of remaining warrant liability to additional paid-in capital	(408		)
Balance at January 31, 2018	$	—

During the years ended January 31, 2018, 2017 and 2016, the Company had no transfers between levels of the fair value hierarchy of its assets measured at fair value.

Assets and Liabilities Measured at Fair Value on a Recurring Basis

The carrying amounts of certain financial instruments, including cash held in banks, accounts receivable and accounts payable approximate fair value due to their short-term maturities and are excluded from the fair value table above.