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Stock-Based Compensation - Summary of Restricted Stock Award Activity under Plans (Details) - Restricted Stock Awards - A&R 2019 Plan and 2019 Inducement Plan	9 Months Ended
	Sep. 30, 2021 $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unvested Shares of Restricted Stock Outstanding, Beginning balance | shares	3,364,366
Unvested Shares of Restricted Stock Outstanding, Ending balance | shares	2,128,173
Weighted-Average Grant Date Fair Value, Beginning balance | $ / shares	$ 4.47
Weighted-Average Grant Date Fair Value, Ending balance | $ / shares	$ 5.22
2020 Stock and Equity Award Exchange Program
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unvested Shares of Restricted Stock Outstanding, Granted | shares	382,122
Unvested Shares of Restricted Stock Outstanding, Vested | shares	(382,122)
Weighted-Average Grant Date Fair Value, Granted | $ / shares	$ 61.31
Weighted-Average Grant Date Fair Value, Vested | $ / shares	$ 61.31
Regular Equity Program
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unvested Shares of Restricted Stock Outstanding, Vested | shares	(1,231,043)
Unvested Shares of Restricted Stock Outstanding, Cancelled | shares	(5,150)
Weighted-Average Grant Date Fair Value, Vested | $ / shares	$ 3.16
Weighted-Average Grant Date Fair Value, Cancelled | $ / shares	$ 7.27

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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