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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Revenue Recognition
Customer contract period	90 days
Contract Liabilities
Deferred revenue	$ 19,963	$ 9,275
Receivables, net
Contract Assets
Receivables, unbilled	61,339	37,142
Accrued liabilities
Contract Liabilities
Deferred revenue	$ 19,963	$ 9,275

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The general duration of contracts with customers.

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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, classified as current.

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

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