Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Oct. 31, 2015	Oct. 31, 2014
Cash flows from operating activities:
Net loss	$ (11,045)	$ (5,284)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	866	643
Expense related to modification of warrants	436
Depreciation expense	36	4
Amortization expense	22
Noncash interest expense		25
Changes in assets and liabilities:
Accounts receivable	(8)
Inventories	(176)
Prepaid expenses and other assets	(40)	(140)
Accounts payable	609	354
Accrued expenses and other liabilities	341	106
Accrued payroll	29	56
Related party payables	(49)	157
Net cash used in operating activities	(8,979)	(4,079)
Cash flows from investing activities:
Change in restricted cash		(35)
Purchase of property and equipment	(26)	(157)
Net cash used in investing activities	(26)	(192)
Cash flows from financing activities:
Net proceeds from the sale of common stock	7,821
Proceeds from exercises of stock options	48	63
Net proceeds from the sale of convertible redeemable preferred stock and warrants		5,091
Proceeds from exercise of common stock warrants	1,512
Proceeds from issuance of convertible notes payable	500	280
Net cash provided by financing activities	9,881	5,434
Net increase in cash and cash equivalents	876	1,163
Cash and cash equivalents at beginning of period	1,305	360
Cash and cash equivalents at end of period	$ 2,181	$ 1,523