Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017
Cash flows from operating activities:
Net loss	$ (14,551)	$ (6,900)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization of property and equipment	737	1,198
Amortization of intangible assets	815	1,214
Stock-based compensation expense	1,802	1,530
Deferred income taxes	(758)	79
Other	76	8
Changes in operating assets and liabilities:
Accounts receivable	10,115	4,358
Unbilled receivables	(2,335)	2,558
Inventories	(165)	57
Prepaid expenses and other assets	(1,584)	8
Accounts payable	371	(2,594)
Accrued expenses	(10,640)	(3,193)
Deferred revenues	(5,729)	(870)
Other operating activities	2,430	230
Total cash used in operating activities	(19,416)	(2,317)
Cash flows from investing activities:
Purchases of property and equipment	(284)	(274)
Purchases of marketable securities	(4,354)	(4,501)
Proceeds from sale and maturity of marketable securities	2,761	4,449
Other investing activities	(60)	287
Total cash used in investing activities	(1,937)	(39)
Cash flows from financing activities:
Proceeds from issuance of common stock	73	26
Payments of withholding tax on RSU vesting	(34)	(36)
Total cash provided by (used in) financing activities	39	(10)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	2,593	(742)
Net decrease in cash, cash equivalents and restricted cash	(18,721)	(3,108)
Cash, cash equivalents and restricted cash, beginning of period	43,661	28,411
Cash, cash equivalents and restricted cash, end of period	24,940	25,303
Supplemental disclosure of cash flow information:
Income taxes paid	$ 2,735	$ 183