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Summary of Significant Accounting Policies - Customer Concentration (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 USD ($) customer segment | Dec. 31, 2023 USD ($) customer segment | Dec. 31, 2022 USD ($) customer
Customer Concentration |  |  |
Number of Operating Segments | segment | 1 | 1 |
Accounts receivable |  |  |
Customer Concentration |  |  |
Number of customers | customer |  | 1 | 2
Accounts receivable | Customer concentration risk | Customer 1 |  |  |
Customer Concentration |  |  |
Concentration risk (as a percent) |  | 82.00% | 21.00%
Amount of concentration risk |  | $ 2,011 | $ 317
Accounts receivable | Customer concentration risk | Customer 2 |  |  |
Customer Concentration |  |  |
Concentration risk (as a percent) |  |  | 10.00%
Amount of concentration risk |  |  | $ 151
Revenue |  |  |
Customer Concentration |  |  |
Number of customers | customer | 2 | 1 | 2
Revenue | Customer concentration risk | Customer 1 |  |  |
Customer Concentration |  |  |
Concentration risk (as a percent) | 23.00% | 9.00% | 11.00%
Amount of concentration risk | $ 523 | $ 465 | $ 799
Revenue | Customer concentration risk | Customer 2 |  |  |
Customer Concentration |  |  |
Concentration risk (as a percent) | 20.00% | 44.00% | 6.00%
Amount of concentration risk | $ 455 | $ 2,374 | $ 436

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 954 -SubTopic 310 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481027/954-310-50-2 + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-42 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-21 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-20 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482861/275-10-50-18 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482861/275-10-50-20 + Details
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