Revenue - product sales and recycling services - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Accounts receivable, allowance for credit loss, current	$ 0		$ 0		$ 0
Accounts receivable, credit loss expense (reversal)			0
Accounts receivable, allowance for credit loss, writeoff, excluding noncash portion	$ 1,000,000.0	$ 100,000	$ 1,000,000.0	$ 1,100,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-07-01
Disaggregation of Revenue [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	6 months		6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-07-01 | Product revenue
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, amount	$ 600,000		$ 600,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-07-01 | Service
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, amount	$ 5,300,000		$ 5,300,000
Minimum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-07-01
Disaggregation of Revenue [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	3 years		3 years
Maximum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-07-01
Disaggregation of Revenue [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	5 years		5 years