Stock-Based Compensation - Schedule of Fair Value of Stock Options Assumptions (Details)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
2016 Stock Incentive Plan [Member] \| Black-Scholes Option Pricing Model [Member] \| Up-List [Member]
Risk-free interest rate	0.45%
Expected dividend yield	0.00%
Expected volatility	71.00%
Expected life	6 years
2016 Stock Incentive Plan [Member] \| Black-Scholes Option Pricing Model [Member] \| No Up-List [Member]
Risk-free interest rate	0.45%
Expected dividend yield	0.00%
Expected volatility	132.00%
Expected life	6 years
2019 Equity Incentive Plan [Member] \| Black-Scholes Option Pricing Model [Member] \| Up-List [Member]
Risk-free interest rate, minimum	0.20%	1.51%
Risk-free interest rate, maximum	0.79%	2.59%
Expected dividend yield	0.00%	0.00%
Expected volatility, minimum	61.00%	69.00%
Expected volatility, maximum	91.00%	95.00%
2019 Equity Incentive Plan [Member] \| Black-Scholes Option Pricing Model [Member] \| Up-List [Member] \| Minimum [Member]
Expected life	3 years	3 years
2019 Equity Incentive Plan [Member] \| Black-Scholes Option Pricing Model [Member] \| Up-List [Member] \| Maximum [Member]
Expected life	6 years 8 months 12 days	6 years
2019 Equity Incentive Plan [Member] \| Black-Scholes Option Pricing Model [Member] \| No Up-List [Member]
Risk-free interest rate, minimum	0.20%	1.51%
Risk-free interest rate, maximum	0.79%	2.59%
Expected dividend yield	0.00%	0.00%
Expected volatility, minimum	61.00%	119.00%
Expected volatility, maximum	142.00%	149.00%
2019 Equity Incentive Plan [Member] \| Black-Scholes Option Pricing Model [Member] \| No Up-List [Member] \| Minimum [Member]
Expected life	3 years	3 years
2019 Equity Incentive Plan [Member] \| Black-Scholes Option Pricing Model [Member] \| No Up-List [Member] \| Maximum [Member]
Expected life	6 years 8 months 12 days	6 years
2019 Equity Incentive Plan [Member] \| Monte Carlo Model [Member] \| Up-List [Member]
Risk-free interest rate, minimum		2.20%
Risk-free interest rate, maximum		2.70%
Expected dividend yield		0.00%
Expected volatility, minimum		140.00%
Expected volatility, maximum		146.00%
Expected life		10 years
2019 Equity Incentive Plan [Member] \| Monte Carlo Model [Member] \| No Up-List [Member]
Risk-free interest rate, minimum		2.16%
Risk-free interest rate, maximum		2.71%
Expected dividend yield		0.00%
Expected volatility		110.00%
Expected life		10 years
Stock Options Outside 2016 Plan and 2019 Plan [Member] \| Black-Scholes Option Pricing Model [Member] \| Up-List [Member]
Risk-free interest rate, minimum		2.49%
Risk-free interest rate, maximum		2.57%
Expected dividend yield		0.00%
Expected volatility, minimum		74.00%
Expected volatility, maximum		95.00%
Stock Options Outside 2016 Plan and 2019 Plan [Member] \| Black-Scholes Option Pricing Model [Member] \| Up-List [Member] \| Minimum [Member]
Expected life		3 years
Stock Options Outside 2016 Plan and 2019 Plan [Member] \| Black-Scholes Option Pricing Model [Member] \| Up-List [Member] \| Maximum [Member]
Expected life		5 years 9 months 18 days
Stock Options Outside 2016 Plan and 2019 Plan [Member] \| Black-Scholes Option Pricing Model [Member] \| No Up-List [Member]
Risk-free interest rate, minimum		2.49%
Risk-free interest rate, maximum		2.57%
Expected dividend yield		0.00%
Expected volatility, minimum		122.00%
Expected volatility, maximum		142.00%
Stock Options Outside 2016 Plan and 2019 Plan [Member] \| Black-Scholes Option Pricing Model [Member] \| No Up-List [Member] \| Minimum [Member]
Expected life		3 years
Stock Options Outside 2016 Plan and 2019 Plan [Member] \| Black-Scholes Option Pricing Model [Member] \| No Up-List [Member] \| Maximum [Member]
Expected life		5 years 9 months 18 days
ABG Warrants [Member] \| Monte Carlo Model [Member] \| Up-List [Member]
Risk-free interest rate, minimum		2.00%
Risk-free interest rate, maximum		2.10%
Expected dividend yield		0.00%
Expected volatility, minimum		51.00%
Expected volatility, maximum		52.00%
ABG Warrants [Member] \| Monte Carlo Model [Member] \| Up-List [Member] \| Minimum [Member]
Expected life		6 years
ABG Warrants [Member] \| Monte Carlo Model [Member] \| Up-List [Member] \| Maximum [Member]
Expected life		7 years 3 months 19 days
ABG Warrants [Member] \| Monte Carlo Model [Member] \| No Up-List [Member]
Risk-free interest rate, minimum		2.00%
Risk-free interest rate, maximum		2.10%
Expected dividend yield		0.00%
Expected volatility, minimum		121.00%
Expected volatility, maximum		123.00%
ABG Warrants [Member] \| Monte Carlo Model [Member] \| No Up-List [Member] \| Minimum [Member]
Expected life		6 years 2 months 12 days
ABG Warrants [Member] \| Monte Carlo Model [Member] \| No Up-List [Member] \| Maximum [Member]
Expected life		7 years 3 months 19 days

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 estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

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The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

No definition available.

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The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

No definition available.

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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

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

+ References

No definition available.

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

+ References

No definition available.

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809

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