Accrued Liabilities - Schedule of Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accrued Liabilities [Line Items]
Accrued payroll and related employee costs	$ 6,517	$ 3,874
Accrued taxes	1,480	1,635
Accrued professional fees	2,010	2,339
Other	3,136	7,542
Accrued liabilities	$ 13,143	15,390
Tails Inc.
Accrued Liabilities [Line Items]
Other		$ 4,500