CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Oct. 31, 2017	Jan. 31, 2017
Current assets:
Cash and cash equivalents	$ 4,947	$ 3,990
Short-term investments	48,574	49,211
Accounts receivable, net	3,542	4,714
Inventories	6,216	5,830
Deferred inventory costs	1,132	1,620
Prepaid expenses and other current assets	3,118	1,891
Total current assets	67,529	67,256
Property and equipment, net	4,527	4,176
Intangible assets, net	293	537
Goodwill	1,117	1,117
Other assets	284	252
Total assets	73,750	73,338
Current liabilities:
Accounts payable	6,206	5,857
Accrued expenses	12,967	11,579
Deferred revenue	15,812	15,521
Total current liabilities	34,985	32,957
Other liabilities	507	561
Total liabilities	35,492	33,518
Commitments and contingencies (Note 5)
Stockholders’ equity:
Preferred stock $0.0001 par value: 10,000,000 shares authorized; none issued and outstanding.
Common stock $0.0001 par value: 100,000,000 shares authorized; 18,979,480 and 17,995,555 shares issued and outstanding on October 31, 2017 and January 31, 2017, respectively.	2	2
Additional paid-in capital	126,296	117,639
Accumulated other comprehensive loss	(36)	(11)
Accumulated deficit	(88,004)	(77,810)
Total stockholders’ equity	38,258	39,820
Total liabilities and stockholders’ equity	$ 73,750	$ 73,338

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.