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Stock based awards - Stock-based compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended	6 Months Ended
	Jun. 30, 2019	Apr. 30, 2019	Jun. 30, 2019	Jun. 30, 2019
Stock-based compensation
Total stock based compensation for options granted			$ 402	$ 617
Total unrecognized compensation cost related to unvested stock-based awards	$ 6,702		6,702	$ 6,702
Weighted average period of recognition for unrecognized compensation cost				3 years 4 months 6 days
Proceeds from the early exercise of stock options in exchange for restricted common stock				$ 300
Common Stock
Stock-based compensation
Issuance of restricted common stock upon early exercise of stock options (in shares)	487,933	487,933		487,933
Exercise price of common stock purchase	$ 0.61	$ 0.61
Proceeds from the early exercise of stock options in exchange for restricted common stock	$ 300	$ 300
Research and Development Expense
Stock-based compensation
Total stock based compensation for options granted			94	$ 176
General and Administrative Expense
Stock-based compensation
Total stock based compensation for options granted			$ 308	$ 441

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- Definition

The exercise price of purchase of early exercised option in exchange for restricted stock.

+ References

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The cash inflow associated with the amount of early exercised of stock option in exchange for restricted stock.

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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

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Number, before forfeiture, of shares issued under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).

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