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Segment information - Reconciliation of Loss from Operations from Segments to Loss from Continuing Operations Before Income Taxes (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]                      
Operating income (loss) $ (2,387) $ (11,669) $ (17,964) $ (10,498) $ (5,653) $ (12,357) $ (7,856) $ (8,172) $ (42,518) $ (34,038) $ (44,400)
Total other expense [1]                 (10,688) (9,090) (14,768)
Loss before income taxes                 (53,206) (43,128) (59,168)
Operating Segments [Member]                      
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]                      
Operating income (loss)                 (17,764) (15,123) (13,737)
Corporate [Member]                      
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]                      
Operating income (loss) [2]                 $ (24,754) $ (18,915) $ (30,663)
[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. The segment information for the years ended December 31, 2016 and 2015 was reclassified to conform to the current period presentation.