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Revenue Recognition - Narrative (Details) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Jul. 16, 2021 shares | Jul. 15, 2021 shares | Dec. 31, 2023 USD ($) unit | Dec. 31, 2022 USD ($) unit
Disaggregation of Revenue [Line Items] |  |  |  |
Current portion of contract assets |  |  | $ 3,707 | $ 2,852
Contract assets, noncurrent |  |  | 451 | 1,386
Revenue recognized in relation to the beginning of the year contract liability balance |  |  | 19,104 | 6,632
Lease revenue (less than) |  |  | 37,444 | 18,916
Deferred asset related to commissions |  |  | 11,400 | 9,000
Amortized commissions |  |  | 5,600 | 4,100
General and administrative |  |  | 42,091 | 37,719
Contingently issuable common stock liability |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Issuance of common stock in connection with the consummation of the PIPE Investment (in shares) | shares | 517,500 | 4,312,500 |  |
Related Party |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Lease revenue (less than) |  |  | $ 900 | $ 600
Give Evolv LLC |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Number of Evolv Express units donated | unit |  |  | 5 | 6
General and administrative |  |  | $ 200 | $ 200

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