Description of the Business - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) segment	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)	Dec. 30, 2020 USD ($)
Description of the Business [Line Items]
Number of reportable segments | segment			1
Net loss	$ 13,932	$ 26,993	$ 78,029	$ 95,140
Cash (used in) provided by operating activities			(2,363)	$ (7,897)
Cash and cash equivalents	42,470		42,470		$ 55,774
Unused borrowing capacity	700		700
Accumulated deficit	600,748		600,748		523,063
Unsecured convertible notes due 2026
Description of the Business [Line Items]
Aggregate principal amount	150,000		150,000
Revolving Credit Facility
Description of the Business [Line Items]
Unused borrowing capacity	700		700		$ 1,000
Maximum borrowing capacity						$ 50,000
Debt instrument, covenants, liquidity threshold	$ 25,000		$ 25,000			$ 25,000
CM Partners, LLC
Description of the Business [Line Items]
Percentage of membership interests acquired	100.00%		100.00%