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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Statement Of Financial Position [Abstract]    
Available-for-sale debt securities, amortized cost $ 86,963  
Available-for-sale debt securities, allowance for credit losses 0  
Allowance for credit losses $ 7,336 $ 566
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 15,000,000 10,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 350,000,000 150,000,000
Common stock, shares issued (in shares) 110,182,000 63,622,000
Common stock, shares outstanding (in shares) 104,775,000 49,620,000
Treasury stock, shares (in shares) 5,407,000 14,002,000