Annual report pursuant to Section 13 and 15(d)

Income Taxes Unrecognized Tax Benefits (Details)

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Income Taxes Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Gross unrecognized tax benefits, beginning of year $ 1,724 $ 1,136
Increases related to prior year income tax positions 7 2
Increases related to current year income tax positions 49 586
Gross unrecognized tax benefits, end of year $ 1,780 $ 1,724