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Segment information - Reconciliation of Loss from Operations from Segments to Loss Before Income Taxes (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Operating loss (income) $ (11,669) $ (12,357) $ (40,131) $ (28,385)
Total other expense [1] (2,426) (1,880) (7,098) (6,834)
Loss before income taxes (14,095) (14,237) (47,229) (35,219)
Operating Segments [Member]        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Operating loss (income) (6,107) (8,181) (20,731) (13,898)
Corporate [Member]        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Operating loss (income) [2],[3] $ (5,562) $ (4,176) $ (19,400) $ (14,487)
[1] Other expense, primarily represents non-operating income and expense, including interest expense, net, and other expenses, net, which the Company does not allocate into segments
[2] Corporate primarily represents corporate administrative costs that are not allocated to individual segments.
[3] Corporate primarily represents corporate administrative costs that are not allocated to individual segments. The segment information for the three and nine months ended September 30, 2016 was reclassified to conform to the current period presentation.