The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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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.

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The amount estimated amortization expense of intangible assets.

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Intangible assets, net (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
Intangible assets, net (Details) - USD ($) $ in Millions	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Intangible assets, net
Amortization expense for intangible assets	$ 0.8	$ 0.8
Estimated annual amortization expense			$ 3.1
Developed technology
Intangible assets, net
Intangible assets, gross	31.6			$ 31.6
Intangible assets, accumulated amortization	$ 4.1			$ 3.3