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Stock-Based Compensation - Fair Value of Employee Option Grant Estimated on Date of Grant (Details) - Equity Option - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated weighted-average fair value (USD per share)	$ 11.81	$ 16.30	$ 9.91	$ 10.22
Weighted Average
Weighted-average assumptions
Expected volatility	79.00%	78.00%	81.00%	77.00%
Expected term, in years	6 years 1 month 6 days	6 years 1 month 6 days	6 years	6 years
Risk-free interest rate	2.10%	2.77%	2.44%	2.66%
Expected dividend yield	0.00%	0.00%	0.00%	0.00%

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Rate of weighted-average expected volatility for award under share-based payment arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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