Stock-Based Compensation - Assumptions (Details)	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019
Fair value assumptions
Expected term		6 years 29 days
Expected volatility		69.70%
Risk free interest rate		1.96%
Expected dividend yield	0.00%	0.00%
Minimum
Fair value assumptions
Expected term	5 years 6 months
Expected volatility	69.70%
Risk free interest rate	0.30%
Maximum
Fair value assumptions
Expected term	6 years 29 days
Expected volatility	81.10%
Risk free interest rate	1.00%

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- Definition

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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- Definition

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

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- Definition

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

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- Definition

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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