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v3.25.1

Summary of significant accounting policies - Narrative (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 USD ($) segment | Mar. 31, 2024 USD ($) | Dec. 31, 2024 USD ($)
Accounting Policies [Line Items] |  |  |
Cash held in banks outside of the US | $ 100,000 |  | $ 200,000
Guaranteed investment certificates | 365,000 |  | 365,000
Allowance for doubtful accounts for expected credit losses | 0 |  | 0
Software development costs, net of amortization | 1,600,000 |  | 1,600,000
Amortization of software development costs | 1,200,000 |  | 1,100,000
Software development amortization expense | $ 100,000 | $ 100,000 |
Product warranty term | 1 year |  |
Number of operating segments | segment | 1 |  |
Number of reportable segments | segment | 1 |  |
Contract assets (less than) | $ 100,000 |  | 100,000
Non-current deferred revenue | 0 |  | 0
Current deferred revenue | 6,092,000 |  | $ 6,599,000
Revenue recognized which was included in deferred revenue in prior period | 2,100,000 | 1,400,000 |
Advertising costs | $ 100,000 | $ 100,000 |
Software Development |  |  |
Accounting Policies [Line Items] |  |  |
Amortization period of capitalized software costs | 5 years |  |

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