CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013	Jan. 31, 2013
Current assets:
Cash	$ 104,277	$ 100,494
Accounts receivable, net	23,467	20,153
Inventories	9,325	8,918
Restricted cash	3	3
Deferred tax assets, current	1,219	1,220
Prepaid expenses and other current assets	1,839	2,360
Total current assets	140,130	133,148
Property and equipment, net	2,976	2,536
Deferred tax assets, non-current	1,079	938
Other assets	2,054	1,981
Total assets	146,239	138,603
Current liabilities:
Accounts payable	9,987	6,674
Accrued liabilities	11,184	14,419
Income taxes payable	171	286
Deferred revenue, current	4,024	3,451
Total current liabilities	25,366	24,830
Other long-term liabilities	1,470	1,441
Total liabilities	26,836	26,271
Commitments and contingencies (Note 10)
Shareholders' equity:
Preference shares, $0.00045 par value per share, 20,000,000 shares authorized and no shares issued and outstanding at April 30, 2013 and January 31, 2013, respectively
Ordinary shares, $0.00045 par value per share, 200,000,000 shares authorized at April 30, 2013 and January 31, 2013, respectively; 27,258,434 shares issued and outstanding at April 30, 2013; 27,035,074 shares issued and outstanding at January 31, 2013	12	12
Additional paid-in capital	94,241	91,911
Retained earnings	25,150	20,409
Total shareholders' equity	119,403	112,332
Total liabilities and shareholders' equity	$ 146,239	$ 138,603