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Notes payable (Details) $ in Thousands				1 Months Ended	12 Months Ended
Notes payable (Details) $ in Thousands	Mar. 02, 2020 USD ($)	Apr. 15, 2019 installment	Apr. 14, 2014	Aug. 31, 2018 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Oct. 31, 2018 USD ($)
Long Term Debt
End Of Term Fee					$ 50,000
Loan principal payment installment \| installment		4
Non-cash interest expense					100	$ 100	$ 200
Loan agreement
Long Term Debt
Additional amounts available to borrow					$ 0	$ 0
Loan agreement \| Minimum
Long Term Debt
Interest rate (as a percent)			8.00%
Amendment 5 to loan agreement
Long Term Debt
Term fee	$ 100			$ 80
Cost incurred upon execution				$ 50
Amendment 6 to loan agreement
Long Term Debt
Certificate of deposit associated with the lease								$ 1,000
Prime rate \| Loan agreement
Long Term Debt
Margin on variable interest rate (as a percent)			(5.25%)