Quarterly report pursuant to Section 13 or 15(d)

Restructuring Charges - Components of Accrued Restructuring Costs (Details)

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Restructuring Charges - Components of Accrued Restructuring Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Restructuring Cost And Reserve [Line Items]      
Balance at period start [1]   $ 3,594  
Restructuring charges, net $ 29 (3,451) $ (15)
Balance at period end 444 444  
Employee Severance and Other Benefits [Member]      
Restructuring Cost And Reserve [Line Items]      
Balance at period start   3,594  
Restructuring charges, net   3,451  
Cash payments   (6,601)  
Balance at period end $ 444 $ 444  
[1] The condensed consolidated balance sheet as of December 31, 2016 has been derived from the audited consolidated financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016.