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Discontinued Operations - Schedule of Income Loss from Discontinued Operations (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
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Gain (Loss) from discontinued operations $ (30) $ (16) $ (1) $ 0 $ (1) $ (4) $ (14) $ (23) $ (47) $ (43) $ 873
DigiNotar B.V. [Member]                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Gain (Loss) from operations                 (47) 0 0
Gain (Loss) on disposal                 0 (43) 873
Gain (Loss) from discontinued operations                 $ (47) $ (43) $ 873