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Income Taxes - Components of Provision (Benefit) for Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current                      
State                 $ 42 $ 12 $ 69
Foreign                 19 44 0
Total Current                 61 56 69
Deferred                      
Federal                 0 (32) (76)
Total Deferred                 0 (32) (76)
Total income tax provision $ (6) $ 25 $ 33 $ 9 $ 1 $ (8) $ 12 $ 19 $ 61 $ 24 $ (7)