Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Oct. 31, 2019	Jan. 31, 2019
Current assets:
Cash and cash equivalents	$ 252,310	$ 194,047
Marketable debt securities	148,481	164,861
Accounts receivable, net	21,609	26,212
Inventories	19,845	18,252
Restricted cash	9	11
Prepaid expenses and other current assets	5,174	6,206
Total current assets	447,428	409,589
Property and equipment, net	5,927	6,728
Deferred tax assets, non-current	10,320	10,587
Intangible assets, net	8,232	10,936
Operating lease right-of-use assets, net	10,595	0
Goodwill	26,601	26,601
Other non-current assets	5,386	2,412
Total assets	514,489	466,853
Current liabilities:
Accounts payable	18,697	12,801
Accrued and other current liabilities	28,447	24,700
Operating lease liabilities, current	2,161	0
Income taxes payable	955	993
Deferred revenue, current	545	529
Total current liabilities	50,805	39,023
Operating lease liabilities, non-current	8,519	0
Other long-term liabilities	9,925	8,341
Total liabilities	69,249	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 October 31, 2019 and January 31, 2019, respectively	0	0
Ordinary shares, $0.00045 par value per share, 200,000,000 shares authorized at October 31, 2019 and January 31, 2019, respectively; 33,540,324 shares issued and outstanding at October 31, 2019; 32,303,540 shares issued and outstanding at January 31, 2019	15	15
Additional paid-in capital	245,490	188,516
Accumulated other comprehensive income	685	97
Retained earnings	199,050	230,861
Total shareholders’ equity	445,240	419,489
Total liabilities and shareholders' equity	$ 514,489	$ 466,853