Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jul. 31, 2013	Jan. 31, 2013
Current assets:
Cash	$ 118,310	$ 100,494
Accounts receivable, net	21,881	20,153
Inventories	9,913	8,918
Restricted cash	3	3
Deferred tax assets, current	1,219	1,220
Prepaid expenses and other current assets	1,478	2,360
Total current assets	152,804	133,148
Property and equipment, net	3,219	2,536
Deferred tax assets, non-current	1,135	938
Other assets	1,995	1,981
Total assets	159,153	138,603
Current liabilities:
Accounts payable	11,440	7,051
Accrued liabilities	12,177	14,042
Income taxes payable	381	286
Deferred revenue, current	4,891	3,451
Total current liabilities	28,889	24,830
Other long-term liabilities	1,461	1,441
Total liabilities	30,350	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 July 31, 2013 and January 31, 2013, respectively
Ordinary shares, $0.00045 par value per share, 200,000,000 shares authorized at July 31, 2013 and January 31, 2013, respectively; 27,557,895 shares issued and outstanding at July 31, 2013; 27,035,074 shares issued and outstanding at January 31, 2013	12	12
Additional paid-in capital	97,387	91,911
Retained earnings	31,404	20,409
Total shareholders' equity	128,803	112,332
Total liabilities and shareholders' equity	$ 159,153	$ 138,603