Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jul. 31, 2019	Jan. 31, 2019
Current assets:
Cash and cash equivalents	$ 222,693	$ 194,047
Marketable debt securities	153,109	164,861
Accounts receivable, net	27,940	26,212
Inventories	17,376	18,252
Restricted cash	9	11
Prepaid expenses and other current assets	4,491	6,206
Total current assets	425,618	409,589
Property and equipment, net	6,105	6,728
Deferred tax assets, non-current	10,417	10,587
Intangible assets, net	9,008	10,936
Operating lease right-of-use assets, net	7,237	0
Goodwill	26,601	26,601
Other non-current assets	5,246	2,412
Total assets	490,232	466,853
Current liabilities:
Accounts payable	18,912	12,801
Accrued and other current liabilities	24,432	24,700
Operating lease liabilities, current	2,260	0
Income taxes payable	1,083	993
Deferred revenue, current	553	529
Total current liabilities	47,240	39,023
Operating lease liabilities, non-current	5,100	0
Other long-term liabilities	9,431	8,341
Total liabilities	61,771	47,364
Commitments and contingencies (Note 13)	0	0
Shareholders' equity:
Preference shares, $0.00045 par value per share, 20,000,000 shares authorized and no shares issued and outstanding at July 31, 2019 and January 31, 2019, respectively	0	0
Ordinary shares, $0.00045 par value per share, 200,000,000 shares authorized at July 31, 2019 and January 31, 2019, respectively; 33,033,619 shares issued and outstanding at July 31, 2019; 32,303,540 shares issued and outstanding at January 31, 2019	15	15
Additional paid-in capital	224,542	188,516
Accumulated other comprehensive income	545	97
Retained earnings	203,359	230,861
Total shareholders’ equity	428,461	419,489
Total liabilities and shareholders' equity	$ 490,232	$ 466,853