CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Oct. 31, 2016	Jan. 31, 2016
Current assets:
Cash and cash equivalents	$ 6,308	$ 27,413
Short-term investments	47,054	27,991
Accounts receivable, net	4,866	5,609
Inventories	4,592	5,011
Deferred inventory costs	1,443	2,013
Prepaid expenses and other current assets	2,033	1,318
Total current assets	66,296	69,355
Property and equipment, net	4,212	4,291
Intangible assets, net	620	885
Goodwill	1,117	1,117
Other assets	303	888
Total assets	72,548	76,536
Current liabilities:
Accounts payable	4,778	4,786
Accrued expenses	11,972	13,010
Short-term capital lease		632
Deferred revenue	14,899	15,036
Total current liabilities	31,649	33,464
Other liabilities	543	182
Total liabilities	32,192	33,646
Commitments and contingencies (Note 7)
Stockholders’ equity:
Preferred stock $0.0001 par value: 100,000,000 shares authorized; no shares issued and outstanding on October 31, 2016 and January 31, 2016, respectively.
Common stock $0.0001 par value: 100,000,000 shares authorized; 17,892,367 and 16,916,250 shares issued and outstanding on October 31, 2016 and January 31, 2016, respectively.	2	2
Additional paid-in capital	115,314	107,679
Accumulated other comprehensive income	18	17
Accumulated deficit	(74,978)	(64,808)
Total stockholders’ equity	40,356	42,890
Total liabilities and stockholders’ equity	$ 72,548	$ 76,536