Revenue Recognition - Contracts with Customer (Details) $ in Thousands	3 Months Ended
Mar. 31, 2019 USD ($)
Contract Assets
January 1, 2019 balance	$ 35
Additions	1,813
Deductions	(1,848)
March 31, 2019 balance	0
Unbilled receivables, current
January 1, 2019 balance	1,916
Additions	423
Deductions	(416)
March 31, 2019 balance	1,923
Unbilled receivables, non-current
January 1, 2019 balance	786
Additions	0
Deductions	0
March 31, 2019 balance	786
Contract Costs
January 1, 2019 balance	42
Additions	0
Deductions	(28)
March 31, 2019 balance	14
Contract Liabilities: Deferred Revenue
January 1, 2019 balance	8,288
Additions	1,386
Deductions	(4,323)
March 31, 2019 balance	5,351
Change in Contract with Customer, Liability [Abstract]
Performance obligations satisfied	2,385
Changes in the estimated transaction price allocated to performance obligations satisfied in prior periods	136
Performance obligations satisfied from new activities in the period - contract revenue	13,062
Total revenue	$ 15,583

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

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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, 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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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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