Basis of Presentation and Summary of Significant Accounting Policies - Summary of Contract Assets and Liabilities (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Contract assets:
Balance at January 1, 2018	$ 739
Additions	4,268
Deductions	(739)
Balance at March 31, 2018	4,268
Contract liabilities:
Balance at January 1, 2018	100
Additions	880
Deductions	0
Balance at March 31, 2018	980
Reclassified from unbilled revenue to accounts receivable	700
Reclassified from deferred revenue to revenue	$ 0