Name:	stdy_AmountOfRightToReceiveEachOutstandingWarrantIssuedPursuantTo2016SubscriptionAgreement
Namespace Prefix:	stdy_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Amount of right to receive consideration for each outstanding warrant issued pursuant to 2017 subscription agreement immediately prior to merger.

No definition available.

Name:	stdy_AmountOfRightToReceiveEachOutstandingWarrantIssuedPursuantTo2017SubscriptionAgreement
Namespace Prefix:	stdy_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Represents the aggregate maximum milestone payments to be achieved by the counterparty per the license agreement.

No definition available.

Name:	stdy_CollaborativeArrangementMilestonePaymentsAggregateMaximum
Namespace Prefix:	stdy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The high end of the range of tiered royalty percentages to be applied per license agreement.

No definition available.

Name:	stdy_CollaborativeArrangementScalingRoyaltiesPercentageHighEndOfRange
Namespace Prefix:	stdy_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

The low end of the range of tiered royalty percentages to be applied per license agreement.

No definition available.

Name:	stdy_CollaborativeArrangementScalingRoyaltiesPercentageLowEndOfRange
Namespace Prefix:	stdy_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

For contingent consideration in connection with a business acquisition, the right to receive additional share price in cash.

No definition available.

Name:	stdy_ContingentConsiderationBusinessAcquisitionAdditionalSharePrice
Namespace Prefix:	stdy_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Maximum exercise price of option to receive consideration at the merger.

No definition available.

Name:	stdy_MaximumExercisePriceOfOptionsToReceiveConsideration
Namespace Prefix:	stdy_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Upfront payment provided for per license agreement.

No definition available.

Name:	stdy_UpfrontPaymentProvidedForPerLicenseAgreement
Namespace Prefix:	stdy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity.

Name:	us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

No definition available.

Name:	us-gaap_BusinessAcquisitionSharePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Amount of liability recognized arising from contingent consideration in a business combination.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 35
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

Name:	us-gaap_BusinessCombinationContingentConsiderationLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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.

No definition available.

Name:	us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Name:	us-gaap_CounterpartyNameAxis=stdy_CardiomePharmaCorpAndCorrevioInternationalSarlMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_TypeOfArrangementAxis=us-gaap_CollaborativeArrangementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	dei_LegalEntityAxis=stdy_UnitedTherapeuticsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: