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Liabilities - Accrued Expenses and Warranty (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Accrued expenses and other current liabilities    
Payroll and related benefits $ 23,016 $ 18,780
Warranty 6,741 4,217
Professional fees 2,943 1,827
Installation 1,386 1,382
Sales, use, and other taxes 1,806 1,282
Restructuring liability 1,373 1,796
Interest 4,244  
Other 2,796 3,917
Total $ 44,305 $ 33,201
Accrued Warranty    
Warranty period 1 year  
Balance, beginning of the year $ 4,217  
Warranties issued 2,809  
Addition from Ultratech acquisition 1,889  
Consumption of reserves (2,673)  
Changes in estimate 499  
Balance, end of the year $ 6,741