Revenue Recognition - Contracts with Customer (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2018
Contract Assets
Beginning balance	$ 0	$ 0
Additions	8,934
Deductions	(8,899)
Ending balance	35	35
Unbilled receivables, current
Beginning balance	0	353
Additions	2,908
Deductions	(992)
Ending balance	1,916	1,916
Unbilled receivables, non-current
Beginning balance	0
Additions	786
Deductions	0
Ending balance	786	786
Contract Costs
Beginning balance	239
Additions	0
Deductions	(197)
Ending balance	42	42
Contract Liabilities: Deferred Revenue
Beginning balance	18,966
Additions	6,446
Deductions	(17,124)
Ending balance	$ 8,288	8,288
Change in Contract with Customer, Liability [Abstract]
Performance obligations satisfied		13,615
Changes in the estimated transaction price allocated to performance obligations satisfied in prior periods		374
Performance obligations satisfied from new activities in the period - contract revenue		46,605
Total revenue		$ 60,594

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, Asset, Unbilled Receivables, Current, Additions

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Contract with Customer, Asset, Unbilled Receivables, Current, Deductions

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Contract with Customer, Asset, Unbilled Receivables, Long-term, Additions

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Contract with Customer, Asset, Unbilled Receivables, Long-term, Deductions

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Contract with Customer, Liability, Deductions

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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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Unbilled Receivables, Current [Roll Forward]

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Unbilled Receivables, Long-term [Roll Forward]

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Unbilled Receivables, Noncurrent

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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 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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Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer.

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