Stock-Based Compensation - Summary of Stock Option Activity (Details) - $ / shares	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Shares
Beginning outstanding balance (in shares)	392,838	303,028
Granted (in shares)	1,972,679	254,882
Cancelled/Forfeited (in shares)	(221,881)	(165,072)
Ending outstanding balance (in shares)	2,143,636	392,838	303,028
Exercisable (in shares)	15,859
Weighted-Average Exercise Price
Beginning outstanding balance (in usd per share)	$ 15.09	$ 26.20
Granted (in usd per share)	9.07	9.54
Cancelled/Forfeited (in usd per share)	18.57	27.24
Ending outstanding balance (in usd per share)	9.19	$ 15.09	$ 26.20
Exercisable (in usd per share)	$ 26.81
Weighted-Average Remaining Contractual Term (years)
Options outstanding	9 years 6 months	5 years 4 months 24 days	2 years 9 months 18 days
Options exercisable	1 year 8 months 12 days

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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No definition available.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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