XML 48 R37.htm IDEA: XBRL DOCUMENT v3.21.1

Common Stock and Stock-Based Compensation - Schedule of Common Stock Shares Reserved for Issuance (Details) - shares	Mar. 31, 2021	Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total shares reserved	5,112,211	18,563,456
Conversion of Outstanding Shares of Convertible Preferred Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total shares reserved		16,079,230
Options Outstanding Under Incentive Award Plans
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total shares reserved	2,544,778	2,466,670
Shares Available for Future Grant under Incentive Award Plans
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total shares reserved	2,327,433	17,556
Shares Available for Future Grant under Employee Stock Purchase Plans
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total shares reserved	240,000

X

- Definition

Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

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

X

- Details

Name:	us-gaap_AwardTypeAxis=tern_ConversionOfOutstandingSharesOfConvertiblePreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AwardTypeAxis=tern_OptionsOutstandingUnderIncentiveAwardPlansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AwardTypeAxis=tern_SharesAvailableForFutureGrantUnderIncentiveAwardPlansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AwardTypeAxis=tern_SharesAvailableForFutureGrantUnderEmployeeStockPurchasePlansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: