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	$ (23,780)	$ (24,305)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	3,613	2,104
Amortization of deferred commissions	2,011	2,024
Stock-based compensation	12,916	3,265
Other non-cash items	202	117
Changes in operating assets and liabilities net of effects from acquisitions:
Accounts receivable	11,854	1,247
Prepaid expenses and other current assets	1,802	(107)
Other assets	893	(879)
Deferred commissions	(1,873)	(1,530)
Accounts payable	(299)	1,101
Accrued expenses and other liabilities	5,158	2,034
Deferred revenue	3,841	7,210
Net cash provided by (used in) operating activities	16,338	(7,719)
Cash flows from investing activities
Acquisitions, net of cash acquired	(39,073)
Purchase of property and equipment	(2,101)	(2,456)
Increase in restricted cash	(217)
Net cash used in investing activities	(41,391)	(2,456)
Cash flows from financing activities
Proceeds from issuance of common stock, net of underwriting discounts, commissions and offering costs	22,264	(2,824)
Proceeds from the exercise of common stock options	6,383	577
Excess tax benefit from stock-based compensation		17
Proceeds from issuance of common stock for employee stock purchase plan	3,025
Net cash provided by (used in) financing activities	31,672	(2,230)
Net increase (decrease) in cash and cash equivalents	6,619	(12,405)
Cash and cash equivalents at beginning of period	201,721	92,348
Cash and cash equivalents at end of period	208,340	79,943
Supplemental disclosure of cash flow data
Cash paid for income taxes	433	80
Supplemental disclosure of non-cash investing and financing activities
Vesting of early exercised stock options	263	212
Property and equipment included in accounts payable and accrued expenses and other current liabilities	$ 63	132
Offering costs included in accounts payable and accrued expenses and other current liabilities		$ 544