Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Oct. 31, 2017		Oct. 31, 2016
Cash flows from operating activities:
Net loss	$ (120,272)		$ (80,253)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	5,330		7,137
Stock-based compensation expense	37,770		10,742
Excess tax benefit from stock-based compensation	0		47
Accretion of balloon payment	1,221		501
Amortization of debt issuance cost, credit facility fees and debt discounts	172		230
Restructuring charges	(940)	[1]	0
Other	(13)		(27)
Changes in operating assets and liabilities:
Accounts receivable	9,588		(4,132)
Inventories	(449)		(1,352)
Prepaid expenses and other assets	(659)		(1,436)
Payment of offering costs	(3,892)		(2,113)
Accounts payable	(1,859)		4,462
Deferred revenue	5,335		7,710
Accrued and other liabilities	(2,943)		280
Net cash used in operating activities	(71,611)		(58,204)
Cash flows from investing activities:
Purchase of property and equipment	(4,100)		(3,431)
Purchase of investments	(11,513)		(13,807)
Proceeds from maturities of investments	5,519		66,692
Net cash provided by (used in) investing activities	(10,094)		49,454
Cash flows from financing activities:
Payment on capital lease financing	(216)		(178)
Proceeds from revolving line of credit	5,000		6,962
Proceeds from term loan	15,000		0
Proceeds from initial public offering, net of underwriting discounts and commissions	62,314		0
Proceeds from repayment of employee notes receivable	0		101
Proceeds from exercise of stock options	470		1,459
Net cash provided by financing activities	82,568		8,344
Foreign exchange impact on cash and cash equivalents	(12)		(48)
Net increase (decrease) in cash and cash equivalents	851		(454)
Cash and cash equivalents, beginning of period	48,048		50,716
Cash and cash equivalents, end of period	48,899		50,262
Supplemental disclosures of cash flow information:
Cash paid for income taxes	120		945
Cash paid for interest	4,942		2,971
Supplemental disclosures of noncash investing and financing activities:
Common stock warrants issued to Series E-2 and F-2 Holders	14,641		0
Conversion of convertible preferred stock to common stock, net of issuance costs	263,729		0
Vesting of early exercised options	833		48
Assets acquired through accounts payable	814		431
Deemed dividend to series E and E-1 Convertible Preferred Stock	6,588		0
Deemed capital contribution from Series E, E-1 and F Convertible Preferred Stock	26,336		0
Repurchase of common stock by way of note forgiveness	1,211		0
Repayment of executive employee promissory notes through repurchase of common stock	$ 7,899		$ 0

[1] The non-cash adjustments to restructuring charges primarily consist of the reversal of previously recognized stock-based compensation expense related to awards that will not vest and the reversal of incentive compensation that will not be paid as a result of the restructuring plan.