Segment disclosures - Revenue based on customer location (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Disclosure of geographical areas [line items]
Revenue	$ 318	$ 463
United States
Disclosure of geographical areas [line items]
Revenue	200	345
China
Disclosure of geographical areas [line items]
Revenue	$ 118	$ 118

The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants.

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+ Details