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Income Taxes - Summary of Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]    
Balance at beginning of year $ 2,385 $ 120
Additions for tax positions of prior years 147  
Additions based on tax positions related to current year 2,252 2,265
Balance at end of year $ 4,784 $ 2,385