Consolidated Balance Sheets - USD ($) $ in Thousands	Jan. 31, 2018	Jan. 31, 2017
Current assets:
Cash and cash equivalents	$ 346,672	$ 322,872
Marketable securities	87,919	82,522
Accounts receivable, net	31,294	38,596
Inventories	23,383	20,145
Restricted cash	9	8
Prepaid expenses and other current assets	4,006	4,392
Total current assets	493,283	468,535
Property and equipment, net	6,449	4,988
Deferred tax assets, non-current	3,642	5,774
Intangible assets, net	14,417	4,149
Goodwill	26,601	26,601
Other non-current assets	2,257	2,224
Total assets	546,649	512,271
Current liabilities:
Accounts payable	19,815	19,955
Accrued and other current liabilities	32,178	26,448
Income taxes payable	936	568
Deferred revenue, current	307	7,425
Total current liabilities	53,236	54,396
Other long-term liabilities	11,226	3,241
Total liabilities	64,462	57,637
Commitments and contingencies (Note 14)	0	0
Shareholders' equity:
Preference shares, $0.00045 par value per share, 20,000,000 shares authorized and no shares issued and outstanding at January 31, 2018 and January 31, 2017, respectively	0	0
Ordinary shares, $0.00045 par value per share, 200,000,000 shares authorized at January 31, 2018 and January 31, 2017, respectively; 33,489,614 shares issued and outstanding at January 31, 2018; 33,369,032 shares issued and outstanding at January 31, 2017	15	15
Additional paid-in capital	221,186	212,276
Accumulated other comprehensive loss	(279)	(70)
Retained earnings	261,265	242,413
Total shareholders’ equity	482,187	454,634
Total liabilities and shareholders' equity	$ 546,649	$ 512,271