Revenue Recognition - Contracts with Customer (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2018
Contract Assets
January 1, 2018 balance		$ 0
Additions		3,953
Deductions		(2,085)
Ending balance	$ 1,868	1,868
Contract Costs
January 1, 2018 balance		239
Additions		0
Deductions		(176)
Ending balance	63	63
Contract Liabilities: Deferred Revenue
January 1, 2018 balance		18,966
Additions		6,446
Deductions		(16,728)
Ending balance	8,684	8,684
Change in Contract with Customer, Liability [Abstract]
Performance obligations satisfied	4,052	12,873
Changes in the estimated transaction price allocated to performance obligations satisfied in prior periods	(229)	(165)
Performance obligations satisfied from new activities in the period - contract revenue	13,123	31,818
Total revenue	$ 16,946	$ 44,526

Change in Contract with Customer, Asset [Roll Forward]

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Change in Contract with Customer, Contract Costs [Roll Forward]

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Change in Contract with Customer, Liability [Roll Forward]

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Contract With Customer, Contract Costs

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Contract With Customer, Contract Costs, Additions

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Contract With Customer, Contract Costs, Deductions

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Contract with Customer, Asset, New Contract Additions

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Contract with Customer, Liability, Deductions

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- Definition

Contract with Customer, Liability, Increase from Cash Receipts

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Contract with Customer, Liability, New Activities, Performance Obligation Satisfied, Revenue Recognition

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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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- Definition

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 arising from contract liability from change in timeframe for performance obligation to be satisfied.

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Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from change in estimate of transaction price which (increases) decreases obligation to transfer good or service to customer for which consideration from customer has been received or is due. Includes, but is not limited to, change in assessment of whether estimate of variable consideration is constrained.

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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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