Annual report pursuant to Section 13 and 15(d)

Income Taxes - Summary of Reconciliation of Unrecognized Tax Benefits (Details)

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Income Taxes - Summary of Reconciliation of Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of liability for unrecognized tax benefits      
Balance at beginning of period $ 1,294 $ 1,062 $ 934
Additions based on tax positions related to current year 595 232 128
Balance at end of period $ 1,889 $ 1,294 $ 1,062