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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