Annual report pursuant to Section 13 and 15(d)

Income Taxes - Components of Provision for Income Taxes (Details)

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Income Taxes - Components of Provision for Income 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
Dec. 31, 2016
Current tax expense (benefit)                      
Federal                   $ 245 $ 451
State                 $ (40) 240 776
Foreign                 171 206  
Total current tax expense                 131 691 1,227
Deferred tax expense (benefit)                      
Federal                 (9,774) 8,709 1,357
State                 (1,630) 92 590
Foreign                 (117) (71)  
Total deferred tax expense (benefit)                 (11,521) 8,730 1,947
Tax benefit for change in valuation allowance                   (767) (968)
Total deferred tax expense (benefit), net                 (11,521) 7,963 979
Income tax expense (benefit) $ (4,222) $ (5,133) $ (964) $ (1,071) $ 6,400 $ 1,479 $ 828 $ (53) $ (11,390) $ 8,654 $ 2,206