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Net Loss Per Share (Narrative) (Details) - $ / shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Subsidiary, Sale of Stock [Line Items]
Shares excluded from diluted loss per share calculation (in shares)	3,553	7,100	3,553	7,100
Share price (in dollars per share)	$ 4.28	$ 9.67	$ 4.28	$ 9.67
Convertible Senior Notes Due 2026 \| Convertible Debt
Subsidiary, Sale of Stock [Line Items]
Interest rate (as a percentage)	0.00%		0.00%
Convertible Senior Notes Due 2026 \| Senior Notes
Subsidiary, Sale of Stock [Line Items]
Conversion price (in dollars per share)			$ 35.92
Incentive Awards
Subsidiary, Sale of Stock [Line Items]
Shares excluded from diluted loss per share calculation (in shares)	531	109	531	109
Restricted Stock
Subsidiary, Sale of Stock [Line Items]
Shares excluded from diluted loss per share calculation (in shares)		1,047		1,047
Dp polar GmbH
Subsidiary, Sale of Stock [Line Items]
Shares excluded from diluted loss per share calculation (in shares)		92		92