0001193125-21-325957 | 10-Q | XBRL Viewer

Label	Element	Value
Adjustment For Deferred Rent	ster_AdjustmentForDeferredRent	$ (76,000)
Adjustment For Deferred Rent	ster_AdjustmentForDeferredRent	(1,334,000)
Debt Instrument Mandatory Principal Prepayment To Be Paid	ster_DebtInstrumentMandatoryPrincipalPrepaymentToBePaid	6,700,000
Unrecognized compensation expense	ster_UnrecognizedCompensationExpense	14,900,000
Accrual For Legal Matters	ster_AccrualForLegalMatters	500,000
Accrual For Legal Matters	ster_AccrualForLegalMatters	100,000
Finite Lived Intangible Assets, Not Yet Been Put In Service	ster_FiniteLivedIntangibleAssetsNotYetBeenPutInService	6,400,000
Accrued Cost Of Revenues Current	ster_AccruedCostOfRevenuesCurrent	10,834,000
Accrued Cost Of Revenues Current	ster_AccruedCostOfRevenuesCurrent	10,341,000
Offering Costs Incurred Included In Accounts Payable And Accrued Liabilities	ster_OfferingCostsIncurredIncludedInAccountsPayableAndAccruedLiabilities	1,996,000
Earnout Amounts Paid	ster_EarnoutAmountsPaid	$ 1,000,000.0
Share Based Compensation By Share Based Award Plan Modification Number Of Options Subject To Modification	ster_ShareBasedCompensationByShareBasedAwardPlanModificationNumberOfOptionsSubjectToModification	4,109,140
Share Based Compensation By Share Based Award Plan Modification Number Of Options Subject To Modification	ster_ShareBasedCompensationByShareBasedAwardPlanModificationNumberOfOptionsSubjectToModification	1,483,124
Debt Instrument Frequency Of Choosing The Method Of Interest	ster_DebtInstrumentFrequencyOfChoosingTheMethodOfInterest	The Company chooses the method of interest for a period of either one month, two months, three months or six months.
Debt Instrument Covenant Minimum Percentage Drawn	ster_DebtInstrumentCovenantMinimumPercentageDrawn	35
Debt Instrument Interest Payment Terms	ster_DebtInstrumentInterestPaymentTerms	Interest is payable on the last business day of the period selected except for the six-month period, where it is payable on the last day of the third and sixth month.
Unrecognized pretax noncash sharebased compensation expense	ster_UnrecognizedPretaxNoncashSharebasedCompensationExpense	$ 79,700,000
Debt Instrument Current Face Amount	ster_DebtInstrumentCurrentFaceAmount	795,000,000.0
Payment To Related Parties Pursuant To Agreement	ster_PaymentToRelatedPartiesPursuantToAgreement	3,200,000
Payment To Related Parties Pursuant To Agreement	ster_PaymentToRelatedPartiesPursuantToAgreement	4,500,000
Payment To Related Parties Pursuant To Agreement	ster_PaymentToRelatedPartiesPursuantToAgreement	$ 1,200,000
Debt Instrument Mandatory Principal Prepayment Paid Year And Month	ster_DebtInstrumentMandatoryPrincipalPrepaymentPaidYearAndMonth	2021-04
Accrued Offering Expenses	ster_AccruedOfferingExpenses	$ 1,424,000
Prepaid expenses related party current	ster_PrepaidExpensesRelatedPartyCurrent	300,000
Prepaid expenses related party current	ster_PrepaidExpensesRelatedPartyCurrent	0
Deferred Commissions Current	ster_DeferredCommissionsCurrent	3,300,000
Deferred Commissions Current	ster_DeferredCommissionsCurrent	$ 2,900,000
Share Based Compensation By Share Based Award Options To Senior Executives And Directors Contingently Vestable	ster_ShareBasedCompensationByShareBasedAwardOptionsToSeniorExecutivesAndDirectorsContingentlyVestable	3,215,432
Earnout Amounts Payable	ster_EarnoutAmountsPayable	$ 9,100,000
Finite Lived Intangible Assets Amortization Expense Year After Year Four	ster_FiniteLivedIntangibleAssetsAmortizationExpenseYearAfterYearFour	80,181,000
Deferred Commissions Non Current	ster_DeferredCommissionsNonCurrent	2,100,000
Deferred Commissions Non Current	ster_DeferredCommissionsNonCurrent	2,500,000
Other Offering Cost	ster_OtherOfferingCost	$ 8,100,000
Number Of Office Space Under Leases	ster_NumberOfOfficeSpaceUnderLeases	2
Payable To Related Party Pursuant To An Agreement	ster_PayableToRelatedPartyPursuantToAnAgreement	$ 950,000
Sale of Stock, Consideration Not Received Per Transaction	ster_SaleOfStockConsiderationNotReceivedPerTransaction	2,000,000.0
Line Of Credit Facility Available Sublimit	ster_LineOfCreditFacilityAvailableSublimit	$ 20,000,000.0
Equity Shares Authorized	ster_EquitySharesAuthorized	1,100,000,000
Increase Decrease In Litigation Settlement Obligation	ster_IncreaseDecreaseInLitigationSettlementObligation	$ (750,000)
Insurance Receivable	ster_InsuranceReceivable	$ 750,000

Summary of Significant Accounting Policies - Summary of Corporate Technology and Production Systems Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Corporate Technology And Production Systems [Abstract]
Development of platform and product initiatives	$ 3,906	$ 4,150	$ 11,242	$ 12,170
Production support and maintenance	2,056	1,996	5,582	5,850
Total production systems	5,962	6,146	16,824	18,020
Corporate technology and production systems	$ 12,084	$ 10,842	$ 32,435	$ 32,922

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