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Net Income Per Share Attributable to Upstart Holdings, Inc. Common Stockholders - Calculation (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Numerator:    
Net income attributable to Upstart Holdings, Inc. common stockholders $ 10,102 $ 1,480
Less: noncumulative dividends to preferred stockholders 0 (1,480)
Net income attributable to common stockholders, basic and diluted $ 10,102 $ 0
Denominator:    
Weighted-average number of shares outstanding used in computing net income per share attributable to Upstart Holdings, Inc. common stockholders, basic (in shares) 73,629,122 14,625,267
Weighted-average effect of dilutive securities (in shares) 17,820,449 0
Weighted-average number of shares outstanding used in computing net income per share attributable to Upstart Holdings, Inc. common stockholders, diluted (in shares) 91,449,571 14,625,267
Net income per share attributable to Upstart Holdings, Inc. common stockholders, basic (in dollars per share) $ 0.14 $ 0
Net income per share attributable to Upstart Holdings, Inc. common stockholders, diluted (in dollars per share) $ 0.11 $ 0