Fair value measurements - Schedule of Significant Unobservable Inputs Used in Black-Scholes Model to Measure Warrants Payable (Details) - $ / shares	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Preferred stock purchase warrants
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Beginning stock price (in dollars per share)		$ 10.27
Strike price (in dollars per share)		$ 17.27
Discount factor		15.00%
Preferred stock purchase warrants \| Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Expected volatility		45.00%
Expected term		2 years
Risk-free interest rate		1.58%
Preferred stock purchase warrants \| Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Expected volatility		49.00%
Expected term		3 years
Risk-free interest rate		1.62%
Common stock purchase warrants
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Beginning stock price (in dollars per share)	$ 30.14	$ 7.19
Strike price (in dollars per share)	$ 1.04	$ 1.04
Expected volatility	56.00%
Expected term	7 days
Risk-free interest rate	0.09%
Discount factor	13.00%	15.00%
Common stock purchase warrants \| Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Expected volatility		81.10%
Expected term		2 years
Risk-free interest rate		1.58%
Common stock purchase warrants \| Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Expected volatility		84.60%
Expected term		3 years
Risk-free interest rate		1.62%

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Strike Price

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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

Restrictions on equity-based instruments during the vesting period, such as the inability to transfer unvested awards, are not taken into account in estimating the fair value of the award. However, restrictions that remain in effect after an award is vested, such as the inability to transfer or hedge vested options or a prohibition on the sale of outstanding vested shares (or other type of equity) for a period of time, affect the estimate of an award's fair value.

+ References

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- Definition

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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- Definition

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

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- Definition

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

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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
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section S99
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-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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