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Income Taxes Provision for Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Current:                    
Federal                 $ 0 $ 0
State taxes                 87 90
Foreign taxes                 1,092 2,865
Total current                 1,179 2,955
Deferred:                    
Federal                 0 0
State taxes                 0 0
Total deferred                 0 0
(Provision) benefit for income taxes $ 397 $ 306 $ 285 $ 191 $ 20 $ 216 $ 1,478 $ 1,241 $ 1,179 $ 2,955