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Income Taxes - Change in Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Balance at beginning of year $ 0 $ 2,521
Gross increases related to current period tax positions 0 0
Gross increases related to prior periods tax positions 2,521 0
Gross decreases in tax positions 0 0
Expiration of the statute of limitations 0 0
Balance at end of year $ 2,521 $ 2,521