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Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Forfeitures Rate

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Share-based Compensation Arrangement by Share-based Payment Award, Ratio of Reduction of Number of Authorized Shares of Common Stock Subject to Awards Other Than Options Rights

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Exercise price per share or per unit of warrants or rights outstanding.

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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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Amount of cost to be recognized for option under share-based payment arrangement.

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The cash outflow for cost incurred directly with the issuance of an equity security.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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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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Number of shares authorized for issuance under share-based payment arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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

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Price of a single share of a number of saleable stocks of a company.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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Stockholders' Equity (Narrative) (Details) - USD ($)			12 Months Ended
Stockholders' Equity (Narrative) (Details) - USD ($)	Oct. 14, 2019	Jun. 26, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jun. 04, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock warrants exercised (in shares)	2,728,513
Warrants liability		$ 10,798,000	$ 2,831,000	$ 7,725,000
Awards granted (in shares)			50,000	925,000	0
Aggregate intrinsic value of options exercised			$ 100,000	$ 300,000	$ 1,500,000
Aggregate intrinsic value of options exercisable			0	200,000	700,000
Aggregate intrinsic value of options outstanding			0	$ 900,000	$ 700,000
Total unrecognized compensation expense related to stock options			$ 900,000
Weighted-average period expected to recognize compensation expense (in years)			2 years 1 month 6 days
Preferred stock, shares authorized (in shares)			5,000,000	5,000,000
Preferred stock, par value (in dollars per share)			$ 0.001	$ 0.001
Preferred stock, shares issued (in shares)			0	0
Preferred stock, shares outstanding (in shares)			0	0
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Plan term (in years)			10 years
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares)			634,570	2,578,866	2,872,408
Vested and delivered stock awards shares (in shares)			1,363,152	854,998	2,077,253
Restricted Stock Units \| Employees, Directors and Certain Consultants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Forfeiture rate			10.00%	10.00%	10.00%
Restricted Stock Units \| Senior Executives
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Forfeiture rate			0.00%	0.00%	0.00%
Time-Based Restricted Stock Units \| Employees, Directors and Certain Consultants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested and delivered stock awards shares (in shares)				581,491	1,493,288
Time-Based Restricted Stock Units \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested and delivered stock awards shares (in shares)					165,086
Restricted Stock and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average period expected to recognize compensation expense (in years)			4 years 4 months 24 days
Aggregate intrinsic value for non-vested shares			$ 4,500,000	$ 12,100,000	$ 21,300,000
Total unrecognized compensation expense			$ 5,500,000
2018 Plan \| Pending equity awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)						20,250,000
Ratio of reduction of authorized shares per every common stock subject to awards of option rights (in shares)						1
Ratio of reduction of authorized shares per every common stock subject to awards other than option rights (in shares)						2
Ratio of availability of number of authorized shares of common stock subject to awards of options rights (in shares)						1
Ratio of availability of number of authorized shares of common stock subject to awards other than options rights (in shares)						2
2018 Plan \| Pending equity awards \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)			10,746,533
2018 Plan \| Time-Based Restricted Stock Units \| Employees, Directors and Certain Consultants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares)				1,603,866	2,612,457
Vested and delivered stock awards shares (in shares)				206,108
2018 Plan \| Time-Based Restricted Stock Units \| Employees, Directors and Certain Consultants \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of equity awards (in years)				1 year	3 years
2018 Plan \| Time-Based Restricted Stock Units \| Employees, Directors and Certain Consultants \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of equity awards (in years)				3 years	4 years
2018 Plan \| Performance-Based Restricted Stock Units \| Employees, Directors and Certain Consultants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares)					191,800
Vesting period of equity awards (in years)					3 years
2018 Plan \| Market-based Restricted Stock Units \| Employees, Directors and Certain Consultants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares)				975,000	68,151
Vesting period of equity awards (in years)				10 years	3 years
2019 Plan \| Time-Based Restricted Stock Units \| Employees, Directors and Certain Consultants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares)			634,570
Vested and delivered stock awards shares (in shares)			610,590
Private Placement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sale of common stock (in shares)		2,728,513
Sale price per share (in dollars per share)		$ 7.33
Aggregate gross proceeds from sale		$ 20,000,000.0
Ownership percentage threshold triggering warrants to be settled in cash		20.00%
Maximum common stock ownership percentage		4.99%
Maximum common stock ownership percentage if sixty days notice given		9.99%
Share price (in dollars per share)		$ 5.57
Transaction costs				$ 1,800,000
Private Placement \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of warrant		6 months
Private Placement \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of warrant		5 years
Series B-1 Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants liability		$ 328,000
Series B-1 Warrants \| Private Placement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Anniversary of closing date (in months)		6 months
Number of shares callable by warrants (in shares)		2,347,418
Price of warrants (in dollars per share)		$ 8.52
Series B-2 Warrant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants liability		$ 376,000
Series B-2 Warrant \| Private Placement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Anniversary of closing date (in months)		12 months
Number of shares callable by warrants (in shares)		1,121,076
Price of warrants (in dollars per share)		$ 8.92
Series C Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants liability		$ 6,232,000
Series C Warrants \| Private Placement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period after first anniversary of closing date (in days)		90 days
Discount of VWAP (as a percent)		7.50%
Percentage of VWAP utilized at denominator of shares calculation		92.50%
Percentage of the price per initial share		50.00%
Series A Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in number of shares issuable (in shares)	2,728,513
Warrants liability		$ 3,862,000
Series A Warrants \| Private Placement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares callable by warrants (in shares)		5,457,026
Price of warrants (in dollars per share)		$ 12.00
Exercisable period (in years)		5 years
Volatility \| Private Placement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Measurement input		0.500
Change of control probability rate \| Private Placement \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Measurement input		0.000
Change of control probability rate \| Private Placement \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Measurement input		0.100
Risk-free rate \| Private Placement \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Measurement input		0.017
Risk-free rate \| Private Placement \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Measurement input		0.021
Cost of debt \| Private Placement \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Measurement input		0.167
Cost of debt \| Private Placement \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Measurement input		0.187
Dividend yield \| Private Placement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Measurement input		0
General and administrative \| Private Placement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Transaction costs				800,000
Additional Paid-In Capital \| Private Placement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Transaction costs				$ 1,000,000.0