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Leases - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Lessee Lease Description [Line Items] |  |  |
Lessee operating and financing lease existence of option to terminate |  | true |
Lessee operating and financing leases, period of options to terminate |  | 1 year |
Lessee, operating and finance lease, existence of option to extend |  | true |
Lease cost | $ 368 |  | $ 1,097
Minimum [Member] |  |  |
Lessee Lease Description [Line Items] |  |  |
Operating and financing leases, remaining lease terms |  | 1 year |
Maximum [Member] |  |  |
Lessee Lease Description [Line Items] |  |  |
Operating and financing leases, remaining lease terms |  | 8 years |

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- Definition Lessee operating and finance lease existence of option to extend. + References No definition available. + Details
Name: | osur_LesseeOperatingAndFinanceLeaseExistenceOfOptionToExtend
Namespace Prefix: | osur_
Data Type: | xbrli:booleanItemType
Balance Type: | na
Period Type: | duration

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- Definition Lessee, operating and finance leases, period of options to terminate. + References No definition available. + Details
Name: | osur_LesseeOperatingAndFinanceLeasesPeriodOfOptionsToTerminate
Namespace Prefix: | osur_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Lessee, operating and financing lease existence of option to terminate. + References No definition available. + Details
Name: | osur_LesseeOperatingAndFinancingLeaseExistenceOfOptionToTerminate
Namespace Prefix: | osur_
Data Type: | xbrli:booleanItemType
Balance Type: | na
Period Type: | duration

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- Definition Lessee, operating and financing lease, remaining lease term. + References No definition available. + Details
Name: | osur_LesseeOperatingAndFinancingLeaseRemainingLeaseTerm
Namespace Prefix: | osur_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of lease cost recognized by lessee for lease contract. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 + Details
Name: | us-gaap_LeaseCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- 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: |