Accrued Liabilities - Schedule of Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Accrued Liabilities [Line Items]
Accrued payroll and related employee costs	$ 6,341	$ 3,874
Accrued taxes	1,256	1,635
Accrued professional fees	1,818	2,339
Other	3,025	7,542
Accrued liabilities	$ 12,440	15,390
Tails Inc.
Accrued Liabilities [Line Items]
Other		$ 4,500