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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Stock‑Based Compensation - Stock based compensation expense (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Jul. 20, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Stock-Based Compensation
Stock-based compensation expense		$ 2,076	$ 21	$ 2,677	$ 57
Accelerated vesting, expense recognized		1,100		1,100
Total unrecognized stock‑based compensation expense related to the unvested stock‑based awards		13,600		$ 13,600
Unrecognized stock-based compensation expense, weighted average period				2 years 3 months
Stock option
Stock-Based Compensation
Accelerated vesting, number of shares	60,948
Stock option \| Terminated Employee [Member]
Stock-Based Compensation
Accelerated vesting, number of shares	22,684
Restricted stock awards
Stock-Based Compensation
Accelerated vesting, number of shares	1,541
Research and development expenses
Stock-Based Compensation
Stock-based compensation expense		399	12	$ 617	30
General and administrative expenses
Stock-Based Compensation
Stock-based compensation expense		$ 1,677	$ 9	$ 2,060	$ 27