Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Apr. 30, 2019	Jan. 31, 2019
Current assets:
Cash and cash equivalents	$ 204,444	$ 194,047
Marketable debt securities	161,732	164,861
Accounts receivable, net	26,457	26,212
Inventories	17,635	18,252
Restricted cash	11	11
Prepaid expenses and other current assets	5,025	6,206
Total current assets	415,304	409,589
Property and equipment, net	6,383	6,728
Deferred tax assets, non-current	10,566	10,587
Intangible assets, net	10,134	10,936
Operating lease right-of-use assets, net	7,911	0
Goodwill	26,601	26,601
Other non-current assets	2,352	2,412
Total assets	479,251	466,853
Current liabilities:
Accounts payable	16,055	12,801
Accrued and other current liabilities	22,523	24,700
Operating lease liabilities, current	2,390	0
Income taxes payable	682	993
Deferred revenue, current	565	529
Total current liabilities	42,215	39,023
Operating lease liabilities, non-current	5,635	0
Other long-term liabilities	8,963	8,341
Total liabilities	56,813	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 April 30, 2019 and January 31, 2019, respectively	0	0
Ordinary shares, $0.00045 par value per share, 200,000,000 shares authorized at April 30, 2019 and January 31, 2019, respectively; 32,738,600 shares issued and outstanding at April 30, 2019; 32,303,540 shares issued and outstanding at January 31, 2019	15	15
Additional paid-in capital	208,522	188,516
Accumulated other comprehensive income	351	97
Retained earnings	213,550	230,861
Total shareholders’ equity	422,438	419,489
Total liabilities and shareholders' equity	$ 479,251	$ 466,853