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Description of Business and Summary of Significant Accounting Policies - Summary of Impact of Adopting Topic 606 on Condensed Financial Statements - Condensed Consolidated Statement of of Cash Flows (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Net loss	$ (51,219)	$ (20,838)
Changes in prepaid expenses	648	(3,190)
Changes in deferred revenue	(3,872)	$ (2,629)
ASU 2014-09 | Adjustments
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Net loss	(1,103)
Changes in prepaid expenses	(28)
Changes in deferred revenue	1,131
ASU 2014-09 | Balances without adoption of ASC 606
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Net loss	(52,322)
Changes in prepaid expenses	620
Changes in deferred revenue	$ (2,741)

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