Income Taxes - Schedule of Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Allowance for doubtful accounts		$ 6,797
Revenue recognition	$ 99,316	60,099
Net operating loss carryforwards	843	972
Share based compensation	10,886	7,544
Deferred revenue	1,643	1,340
Other temporary differences	1,384	1,147
Total gross deferred taxes assets	114,072	77,899
Less: valuation allowance	(112,360)	(75,804)
Total deferred taxes assets	1,712	2,095
Deferred tax liabilities:
Fixed assets	1,427	1,486
Total gross deferred taxes liabilities	1,427	1,486
Net deferred taxes assets	$ 285	$ 609