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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 Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	$ 5,389		$ 1,874		$ 10,851	$ 3,402
Net loss	$ (19,436)	$ (31,783)	$ (11,826)	$ (9,012)	$ (51,219)	$ (20,838)
Net loss per share attributable to common stockholders- basic and diluted	$ (0.39)		$ (0.75)		$ (1.55)	$ (1.33)
ASU 2014-09 | Adjustments
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	$ (474)				$ (1,103)
Net loss	$ (474)				$ (1,103)
Net loss per share attributable to common stockholders- basic and diluted	$ (0.01)				$ (0.03)
ASU 2014-09 | Balances without adoption of ASC 606
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	$ 4,915				$ 9,748
Net loss	$ (19,910)				$ (52,322)
Net loss per share attributable to common stockholders- basic and diluted	$ (0.40)				$ (1.58)

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- Definition

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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