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Stock-Based Compensation - Restricted Stock Units (Details) - Restricted Stock Units - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Number of Shares
Beginning balance (in shares)	11,301	30,132
Granted (in shares)		9,167
Released (in shares)	(10,810)	(22,057)
Forfeited (in shares)		(5,941)
Ending balance (in shares)	491	11,301
Weighted Average Grant Date Fair Value Per Share
Beginning weighted average grant date fair value (in dollars per share)	$ 147.60	$ 15.38
Granted (in dollars per share)		1.61
Released (in dollars per share)	9.37	8.68
Forfeitures (in dollars per share)		13.82
Ending weighted average grant date fair value (in dollars per share)	$ 15.38	$ 14.36
Intrinsic value, outstanding	$ 7,641	$ 14,013	$ 95,005

X

- Definition

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 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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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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Net number of non-option equity instruments granted to participants.

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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Intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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