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v3.22.1

Shareholders' Equity - Narrative (Details) - Performance Shares | 3 Months Ended
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Mar. 31, 2022
Minimum |
Shareholders' Equity [Line Items] |
Percentage of performance period | 0.00%
Maximum |
Shareholders' Equity [Line Items] |
Percentage of performance period | 200.00%

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- Definition Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Percentage Of Performance Units Expected To Vest + References No definition available. + Details
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Namespace Prefix: | fldm_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition [Line Items] for Shareholders' Equity [Table] + References No definition available. + Details
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Namespace Prefix: | fldm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |