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Summary of significant accounting policies - Fixed Assets (Details)	12 Months Ended
	Dec. 31, 2017
Computer equipment and software
Fixed assets
Estimated useful life	3 years
Furniture, fixtures, and lab equipment | Minimum
Fixed assets
Estimated useful life	3 years
Furniture, fixtures, and lab equipment | Maximum
Fixed assets
Estimated useful life	7 years

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

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