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Restructuring - Utilization of Restructuring Accruals (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Restructuring Reserve [Roll Forward]      
Share-based compensation $ 400 $ 3,400 $ 1,000
Asset impairment charges 520 2,087 355
ADA Analytics Israel, LLC      
Restructuring Reserve [Roll Forward]      
Asset impairment charges   1,900  
Employee Severance      
Restructuring Reserve [Roll Forward]      
Accrual, Beginning balance 2,581 1,690 29
Expense provision 2,045 8,498 3,503
Cash payments and other (3,898) (7,595) (1,842)
Change in estimates (276) (12) 0
Accrual, Ending balance 452 2,581 1,690
Facility Closures      
Restructuring Reserve [Roll Forward]      
Accrual, Beginning balance 777 0 0
Expense provision 0 2,650 0
Cash payments and other (320) (1,873) 0
Change in estimates (210) 0 0
Accrual, Ending balance $ 247 $ 777 $ 0