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Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders’ Equity (Deficit) - USD ($)
$ in Thousands
Total
Total Upstart Holdings, Inc. Stockholders’ Deficit
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Noncontrolling Interest
Beginning balance at Dec. 31, 2019 $ 162,546          
Beginning balance (in shares) at Dec. 31, 2019 47,349,577,000          
Ending balance (in shares) at Mar. 31, 2020 47,349,577,000          
Ending balance at Mar. 31, 2020 $ 162,546          
Beginning balance at Dec. 31, 2019 (61,688) $ (62,714) $ 2 $ 12,489 $ (75,205) $ 1,026
Beginning balance (in shares) at Dec. 31, 2019     14,561,398,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock upon exercise of stock options (in shares)     92,634,000      
Issuance of common stock upon exercise of stock options 185 185   185    
Stock-based compensation expense 2,055 2,055   2,055    
Return of capital to interests in consolidated VIEs (381)         (381)
Net income (loss) 992 1,480     1,480 (488)
Ending balance at Mar. 31, 2020 (58,837) (58,994) $ 2 14,729 (73,725) 157
Ending balance (in shares) at Mar. 31, 2020     14,654,032,000      
Beginning balance at Dec. 31, 2020 $ 0          
Beginning balance (in shares) at Dec. 31, 2020 0          
Ending balance (in shares) at Mar. 31, 2021 0          
Ending balance at Mar. 31, 2021 $ 0          
Beginning balance at Dec. 31, 2020 $ 300,252 300,252 $ 7 369,467 (69,222) 0
Beginning balance (in shares) at Dec. 31, 2020 73,314,026   73,314,026,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock upon exercise of stock options (in shares) 521,511,000   521,511,000      
Issuance of common stock upon exercise of stock options $ 1,492 1,492   1,492    
Issuance of common stock upon settlement of restricted stock units (in shares)     308,000      
Exercise of common stock warrant (in shares) 72,407   72,407,000      
Stock-based compensation expense $ 8,744 8,744   8,744    
Net income (loss) 10,102 10,102     10,102  
Ending balance at Mar. 31, 2021 $ 320,590 $ 320,590 $ 7 $ 379,703 $ (59,120) $ 0
Ending balance (in shares) at Mar. 31, 2021 73,908,252   73,908,252,000