Accrued Liabilities - Schedule of Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accrued Liabilities [Line Items]
Accrued payroll and related employee costs	$ 3,874	$ 7,035
Accrued taxes	1,635	1,554
Accrued professional fees	2,339	1,382
Other	7,542	3,297
Accrued liabilities	15,390	$ 13,268
Tails Inc.
Accrued Liabilities [Line Items]
Other	$ 4,500