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Revenue and Deferred Revenue - Summary of Deferred Revenue, by Arrangement, Disclosure (Details) - USD ($) $ in Thousands | 3 Months Ended
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Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2024 | Mar. 31, 2024
Revenue from Contract with Customer [Abstract] |  |  |  |
Deferred revenue, beginning balance | $ 71,591 | $ 87,659 | $ 119,568 | $ 123,159
Revenue recognized from balance of deferred revenue at the beginning of the period | (8,454) | (21,448) | (8,914) | (8,656)
Revenue deferred during the period | 6,202 | 6,187 | 4,244 | 7,075
Revenue recognized from revenue originated and deferred during the period | (2,982) | (807) | (3,040) | (2,010)
Deferred revenue, ending balance | $ 66,357 | $ 71,591 | $ 111,858 | $ 119,568

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- Definition Revenue recognized from revenue originated and deferred revenue. + References No definition available. + Details
Name: | smrt_RevenueRecognizedFromRevenueOriginatedAndDeferredRevenue
Namespace Prefix: | smrt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(26)(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of deferred revenue recognized for transactions arising during the current reporting period. Deferred revenue is a liability as of the balance sheet date related to a revenue producing activity for which revenue has not yet been recognized. Generally, an Entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of revenue recognized that was previously reported as deferred or unearned revenue. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration