Represents information to the number of customers of the entity which have concentration risk as of balance sheet date.

No definition available.

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- Definition

Represents the value of a letter of credit

+ References

No definition available.

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- Definition

Represents the provision for common stock warrants as a reduction of revenue.

+ References

No definition available.

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The amount of reduction in revenue due to waiving of vesting conditions which resulted in immediate vesting of warrants

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No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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- Definition

Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Commitments and Contingencies - Concentrations of Credit Risk (Details) $ in Thousands			3 Months Ended				6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2020 USD ($) customer	Jul. 20, 2017 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) customer	Jun. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) customer	Dec. 31, 2019 USD ($) customer	Dec. 31, 2018 USD ($) customer
Customer Concentration
Restricted cash	$ 169,000								$ 169,000
Letter of credit	152,400								152,400
Reduction in revenue		$ 10,900							399,700
Consolidated revenue			$ 107,048	$ 67,995	$ 40,819	$ 91,607	$ 108,814	$ 215,862	(93,237)	$ 229,975	$ 174,215
Letter of Credit
Customer Concentration
Letter of credit	$ 500								$ 500
Accounts receivable \| Customer concentration \| Customers
Customer Concentration
Number of customers \| customer	3					2			3	2
Concentration risk (as a percent)									73.90%	62.60%
Revenues \| Customer concentration \| Customers
Customer Concentration
Number of customers \| customer	2					2			2	2	2
Concentration risk (as a percent)									156.20%	49.70%	66.80%
Warrant Transaction Agreements
Customer Concentration
Reduction in revenue	$ 399,700								$ 420,000	$ 4,100	$ 9,800
Warrant Transaction Agreements \| Revenues \| Customer concentration \| Amazon
Customer Concentration
Consolidated revenue									$ 310,100
Concentration risk (as a percent)									332.40%
Provision for common stock warrants									$ 420,000