Grant Expense, Net (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) grant	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) grant	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Other Income and Expenses [Abstract]
Number of grants approved | grant	2		2
Grants approval amount	$ 7,000		$ 7,000
Grant (income) expense, net	(52)	$ 263	(44)	$ 609
Grant income	648	209	977	209
Grant costs	596	472	933	818
Grant payments received	0	$ 1,376	0	$ 1,376
Deferred grant income	232		232		$ 1,136
Grants receivable	$ 204		$ 204		$ 131