Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Apr. 30, 2018	Jan. 31, 2018
Current assets:
Cash and cash equivalents	$ 336,692	$ 346,672
Marketable securities	77,427	87,919
Accounts receivable, net	25,727	31,294
Inventories	22,968	23,383
Restricted cash	9	9
Prepaid expenses and other current assets	3,824	4,006
Total current assets	466,647	493,283
Property and equipment, net	6,645	6,449
Deferred tax assets, non-current	3,650	3,642
Intangible assets, net	13,271	14,417
Goodwill	26,601	26,601
Other non-current assets	2,338	2,257
Total assets	519,152	546,649
Current liabilities:
Accounts payable	17,449	19,815
Accrued and other current liabilities	21,271	32,178
Income taxes payable	385	936
Deferred revenue, current	546	307
Total current liabilities	39,651	53,236
Other long-term liabilities	10,693	11,226
Total liabilities	50,344	64,462
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 April 30, 2018 and January 31, 2018, respectively	0	0
Ordinary shares, $0.00045 par value per share, 200,000,000 shares authorized at April 30, 2018 and January 31, 2018, respectively; 33,396,304 shares issued and outstanding at April 30, 2018; 33,489,614 shares issued and outstanding at January 31, 2018	15	15
Additional paid-in capital	217,880	221,186
Accumulated other comprehensive loss	(389)	(279)
Retained earnings	251,302	261,265
Total shareholders’ equity	468,808	482,187
Total liabilities and shareholders' equity	$ 519,152	$ 546,649