CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)	9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015
Cash flows from operating activities:
Net loss	$ (10,117,000)	$ (10,869,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	7,243,000	2,725,000
Depreciation and amortization	1,320,000	1,046,000
Amortization of intangible assets	265,000	295,000
Write-off of non-cash deferred debt issuance costs		332,000
Other non-cash (income) expense, net	(3,000)	64,000
Change in fair value of acquisition-related contingent consideration		167,000
Change in fair value of warrant liability		442,000
Changes in operating assets and liabilities:
Accounts receivable, net	743,000	(1,853,000)
Inventories	419,000	2,292,000
Deferred inventory costs	570,000	(426,000)
Prepaid expenses and other assets	(99,000)	(531,000)
Accounts payable and accrued expenses	(766,000)	4,509,000
Other liabilities	(47,000)	(88,000)
Deferred revenue	296,000	1,199,000
Net cash used in operating activities	(176,000)	(696,000)
Cash flows from investing activities:
Purchases of short-term investments	(44,178,000)
Proceeds from maturity of short-term investments	20,650,000
Proceeds from sale of short-term investments	4,366,000
Purchases of property and equipment	(1,146,000)	(1,117,000)
Net cash used in investing activities	(20,308,000)	(1,117,000)
Cash flows from financing activities:
Proceeds from initial public offering, net		57,303,000
Repayment of debt and capital leases	(628,000)	(11,457,000)
Payment of acquisition related earn-out	(100,000)	(475,000)
Payment of preferred warrant liability		(584,000)
Proceeds from issuance of common stock related to warrants and employee stock benefit plans	1,447,000	178,000
Net cash (used in) provided by financing activities	(621,000)	49,965,000
Net (decrease) increase in cash and cash equivalents	(21,105,000)	48,152,000
Cash and cash equivalents at beginning of period	27,413,000	9,133,000
Cash and cash equivalents at end of period	6,308,000	57,285,000
Restricted stock units
Cash flows from financing activities:
Shares repurchased for tax withholdings on vesting of restricted stock units	$ (1,340,000)	0
Series Beta Preferred Stock
Cash flows from financing activities:
Proceeds from Series Beta preferred stock, net		$ 5,000,000