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Restructuring - Restructuring Reserve (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Restructuring Reserve [Roll Forward]    
Balance at January 1, 2017 $ 402 $ 0
Additions   1,786
Accretion of lease obligations 21 31
Adjustment of lease obligations 90 (155)
Write-offs   (86)
Payments (163) (1,174)
Balance at December 31, 2017 350 402
Severance and Related Benefits    
Restructuring Reserve [Roll Forward]    
Balance at January 1, 2017 62 0
Additions   770
Payments (62) (708)
Balance at December 31, 2017 0 62
Facilities    
Restructuring Reserve [Roll Forward]    
Balance at January 1, 2017 340 0
Additions   830
Accretion of lease obligations 21 31
Adjustment of lease obligations 90 (155)
Write-offs   9
Payments (101) (375)
Balance at December 31, 2017 350 340
Other    
Restructuring Reserve [Roll Forward]    
Balance at January 1, 2017 0 0
Additions   186
Accretion of lease obligations   0
Adjustment of lease obligations 0 0
Write-offs   (95)
Payments 0 (91)
Balance at December 31, 2017 $ 0 $ 0