Consolidated Balance Sheets - USD ($) $ in Thousands	Jan. 31, 2019	Jan. 31, 2018
Current assets:
Cash and cash equivalents	$ 194,047	$ 346,672
Marketable debt securities	164,861	87,919
Accounts receivable, net	26,212	31,294
Inventories	18,252	23,383
Restricted cash	11	9
Prepaid expenses and other current assets	6,206	4,006
Total current assets	409,589	493,283
Property and equipment, net	6,728	6,449
Deferred tax assets, non-current	10,587	3,642
Intangible assets, net	10,936	14,417
Goodwill	26,601	26,601
Other non-current assets	2,412	2,257
Total assets	466,853	546,649
Current liabilities:
Accounts payable	12,801	19,815
Accrued and other current liabilities	24,700	32,178
Income taxes payable	993	936
Deferred revenue, current	529	307
Total current liabilities	39,023	53,236
Other long-term liabilities	8,341	11,226
Total liabilities	47,364	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 January 31, 2019 and January 31, 2018, respectively	0	0
Ordinary shares, $0.00045 par value per share, 200,000,000 shares authorized at January 31, 2019 and January 31, 2018, respectively; 32,303,540 shares issued and outstanding at January 31, 2019; 33,489,614 shares issued and outstanding at January 31, 2018	15	15
Additional paid-in capital	188,516	221,186
Accumulated other comprehensive income (loss)	97	(279)
Retained earnings	230,861	261,265
Total shareholders’ equity	419,489	482,187
Total liabilities and shareholders' equity	$ 466,853	$ 546,649