Basis of Presentation and Summary of Significant Accounting Policies - Summary of Contract Assets and Liabilities (Details) $ in Thousands	6 Months Ended
Jun. 30, 2018 USD ($)
Contract assets:
Balance at January 1, 2018	$ 739
Additions	44
Deductions	(739)
Balance at June 30, 2018	44
Contract liabilities:
Balance at January 1, 2018	100
Additions	2,008
Deductions	(903)
Balance at June 30, 2018	1,205
Reclassified from unbilled revenue to accounts receivable	700
Reclassified from deferred revenue to revenue	$ (900)

Change In Contract With Customer, Asset [Roll Forward]

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Change In Contract With Customer, Liability [Roll Forward]

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Contract With Customer, Asset, New Contract Deductions

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Contract With Customer, Liability, New Contract Deductions

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Contract with Customer, Liability, New Contract Additions

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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Amount of decrease in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time from transfer to receivable due to right to consideration becoming unconditional.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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