Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Operating activities:
Net loss	$ (28,901)	$ (22,753)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation, amortization and accretion	1,575	887
Stock-based compensation	8,906	3,369
Amortization of deferred commissions	4,039	3,053
Other	270	(130)
Changes in operating assets and liabilities:
Accounts receivable	2,243	3,090
Deferred commissions	(3,033)	(2,756)
Prepaid expenses and other assets	(3,143)	(2,876)
Accounts payable	3,782	3,681
Accrued compensation	(2,121)	(2,855)
Accrued expenses and other liabilities	(223)	(182)
Deferred revenue	6,920	2,437
Net cash used in operating activities	(9,686)	(15,035)
Investing activities:
Capitalization of internal-use software costs	(1,208)	(1,232)
Purchases of property and equipment and other	(2,448)	(927)
Proceeds from sales of securities available for sale	1,538	0
Proceeds from maturities and redemption of securities available for sale	10,335	3,000
Net cash provided by investing activities	8,217	841
Financing activities:
Proceeds from initial public offering, net of underwriters' discounts and commissions	199,997	0
Payments of deferred offering costs	(2,246)	(390)
Proceeds from stock option exercises, net of repurchases, and other	2,564	124
Principal payments on financing arrangements	(207)	(71)
Net cash provided by (used in) financing activities	200,108	(337)
Effects of changes in foreign currency exchange rates on cash and cash equivalents	68	47
Net increase (decrease) in cash and cash equivalents and restricted cash	198,707	(14,484)
Cash and cash equivalents and restricted cash at beginning of year	23,282	58,081
Cash and cash equivalents and restricted cash at end of year	221,989	43,597
Non-cash investing and financing activities:
Vesting of early exercised common stock options	328	356
Issuance of common stock in connection with warrant exercises	272	0
Deferred offering costs, accrued but not yet paid	1,772	125
Property and equipment and other, accrued but not yet paid	1,931	1,183
Issuance of common stock in connection with business combination	2,160	0
Conversion of redeemable convertible preferred stock to common stock	228,362	0
Reconciliation of cash, cash equivalents, and restricted cash within the condensed consolidated balance sheets to the amounts shown in the statements of cash flows above:
Total cash, cash equivalents and restricted cash	$ 23,282	$ 58,081