Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Oct. 31, 2013	Jan. 31, 2013
Current assets:
Cash	$ 128,051	$ 100,494
Accounts receivable, net	25,449	20,153
Inventories	13,010	8,918
Restricted cash	3	3
Deferred tax assets, current	1,073	1,220
Prepaid expenses and other current assets	1,998	2,360
Total current assets	169,584	133,148
Property and equipment, net	3,025	2,536
Deferred tax assets, non-current	1,105	938
Other assets	1,970	1,981
Total assets	175,684	138,603
Current liabilities:
Accounts payable	14,139	7,051
Accrued liabilities	12,066	14,042
Income taxes payable	77	286
Deferred revenue, current	3,552	3,451
Total current liabilities	29,834	24,830
Other long-term liabilities	1,427	1,441
Total liabilities	31,261	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 October 31, 2013 and January 31, 2013, respectively
Ordinary shares, $0.00045 par value per share, 200,000,000 shares authorized at October 31, 2013 and January 31, 2013, respectively; 28,212,643 shares issued and outstanding at October 31, 2013; 27,035,074 shares issued and outstanding at January 31, 2013	13	12
Additional paid-in capital	103,880	91,911
Retained earnings	40,530	20,409
Total shareholders' equity	144,423	112,332
Total liabilities and shareholders' equity	$ 175,684	$ 138,603