Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 151,461	$ 87,426
Marketable securities	258,317	211,941
Trade accounts receivable, net of allowance for credit losses of $3,850 and $1,898 as of March 31, 2021 and December 31, 2020, respectively	216,509	183,857
Other current assets	32,853	40,392
Total current assets	659,140	523,616
Marketable securities, long-term	287,626	132,502
Fixed assets, net	46,987	40,199
Other long-term assets	5,330	4,144
Total assets	999,083	700,461
Current liabilities
Accounts payable	17,440	26,488
Income tax payable	120,522	53,319
Contract liabilities	13,960	26,576
Customer deposit	17,001	185
Investment margin loan	15,048	15,019
Other current liabilities	12,559	8,528
Total current liabilities	196,530	130,115
Unrecognized tax benefits	474	377
Other long-term liabilities	513	582
Total liabilities	197,517	131,074
Commitments and contingencies (Note 8)
Stockholders’ equity
Common stock, $0.0001 par value per share, 50,000 shares authorized, 28,989 and 28,178 shares issued and outstanding at March 31, 2021 and December 31, 2020, respectively	3	3
Preferred stock, $0.0001 par value per share, 1,000 shares authorized, no shares issued or outstanding at March 31, 2021 and December 31, 2020
Additional paid-in capital	450,855	418,065
Accumulated other comprehensive income (loss)	(216)	438
Retained earnings	350,924	150,881
Total stockholders’ equity	801,566	569,387
Total liabilities and stockholders’ equity	$ 999,083	$ 700,461