Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016
Cash flows from operating activities:
Net loss	$ (32,505)	$ (18,355)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization	2,429	1,949
Provision for bad debts	169	190
Stock-based compensation	9,065	3,799
Change in fair value of convertible preferred stock warrant liability	491	42
Deferred income taxes	6	(13)
Amortization of deferred financing costs	69	36
Changes in operating assets and liabilities:
Restricted cash	500	5,789
Accounts receivable	13,168	12,469
Prepaid expenses and other current assets	(2,571)	(1,926)
Deferred commissions	(487)	(548)
Other long term assets	(119)	(454)
Accounts payable, accrued expenses and other current liabilities	(3,506)	(1,604)
Deferred revenue	125	1,170
Deferred rent	(303)	(363)
Other long term liabilities	20	12
Net cash (used in) provided by operating activities	(13,449)	2,193
Cash flows from investing activities:
Purchases of marketable securities	(94,446)	0
Capital expenditures	(1,886)	(1,637)
Purchases of intangible assets	0	(298)
Net cash used in investing activities	(96,332)	(1,935)
Cash flows from financing activities:
Proceeds from initial public offering, net of underwriting discounts and commissions	123,527	0
Payments of deferred offering costs	(4,263)	0
Proceeds from exercise of stock options	2,381	691
Proceeds from exercise of warrants	79	0
Repayments on Revolving Line	(5,000)	0
Payments of deferred financing costs	(99)	(180)
Proceeds from employee stock purchase plan	1,337	0
Net cash provided by financing activities	117,962	511
Effect of exchange rate changes on cash and cash equivalents	278	(89)
Net increase in cash and cash equivalents	8,459	680
Cash and cash equivalents at beginning of period	24,420	30,028
Cash and cash equivalents at end of period	32,879	30,708
Supplemental disclosures of non-cash investing and financing information:
Non-cash capital expenditures, including capitalized stock-based compensation, and items in accounts payable, accrued expenses and other current liabilities	296	128
Conversion of convertible preferred stock to common stock	120,615	0
Conversion of convertible preferred stock warrants to common stock warrants	1,435	0
Cash paid on interest	71	0
Cash paid on income taxes	$ 31	$ 6