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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting [Abstract]                      
Operating income (loss) $ (5,653) $ (12,357) $ (7,856) $ (8,172) $ (34,598) $ (4,523) $ (3,716) $ (1,563) $ (34,038) $ (44,400) $ (777) [1]
Total other expense [2]                 (9,090) (14,768)  
Loss from continuing operations before income taxes                 $ (43,128) $ (59,168) $ (777)
[1] As IDI Holdings, the accounting acquirer of the merger consummated effective as of March 21, 2015, was incorporated on September 22, 2014, the financial data for the corresponding period in 2014 were from September 22, 2014, the date of inception, through December 31, 2014.
[2] Other expense, mainly represents non-operating income and expense, including interest expense, net, contingent earn out costs, and other expenses, net, which the Company does not allocate into segments