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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 Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Deferred revenue - current liabilities	$ 10,767	$ 8,029
Deferred revenue - noncurrent liabilities	77,887	82,217
Accumulated deficit	(156,151)	(84,190)	$ (85,187)
ASU 2014-09 | Adjustments
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Deferred revenue - current liabilities	1,433	407
Deferred revenue - noncurrent liabilities	888	590
Accumulated deficit	2,321	(997)
ASU 2014-09 | Balances without adoption of ASC 606
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Deferred revenue - current liabilities	12,200	8,436
Deferred revenue - noncurrent liabilities	78,775	82,807
Accumulated deficit	$ (153,830)	$ (85,187)

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

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