CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOW (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Cash flows from operating activities:
Net income (loss)	$ 2,214	$ (1,340)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	3,324	1,167
Amortization of deferred contract acquisition costs	7,419	3,917
Amortization of operating lease right-of-use assets	1,533
Stock-based compensation expense	6,662	849
Provision for accounts receivable allowances	828	419
Other	257	11
Changes in operating assets and liabilities:
Accounts receivable	(16,103)	(13,359)
Prepaid expenses and other assets	(8,617)	(1,880)
Deferred contract acquisition costs	(14,434)	(9,121)
Accounts payable	4,373	786
Accrued expenses and other liabilities	12,223	3,682
Deferred revenue	23,557	17,628
Operating lease liabilities, net	(1,000)
Net cash provided by operating activities	22,236	2,759
Cash flows from investing activities:
Purchases of marketable securities	(23,312)	(15,500)
Maturities of marketable securities	28,890	11,820
Purchases of property and equipment	(6,897)	(3,850)
Net cash used in investing activities	(1,319)	(7,530)
Cash flows from financing activities:
Proceeds from initial public offering and private placement, net of underwriting discounts and commissions and other offering costs	543,471
Proceeds from exercise of stock options, net of repurchases	1,781	188
Principal payments on capital lease obligations		(53)
Net cash provided by financing activities	545,252	135
Net increase (decrease) in cash, cash equivalents, and restricted cash	566,169	(4,636)
Cash, cash equivalents, and restricted cash – beginning of period	65,968	36,821
Cash, cash equivalents, and restricted cash – end of period	632,137	32,185
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:
Cash and cash equivalents	629,793	30,810
Restricted cash, current included in prepaid expenses and other current assets	200
Restricted cash, non-current included in other assets, non-current	$ 2,144	$ 1,375