XML 41 R30.htm IDEA: XBRL DOCUMENT v3.21.1

Fair Value - Schedule of Aggregate Fair Value of Marketable Securities (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Due in one year or less	$ 71,059,000
Due after one year through two years	25,693,000
Total marketable securities	$ 96,752,000	$ 0

X

- Definition

Marketable securities maturities after one through two years fair value.

+ References

No definition available.

+ Details

Name:	tern_MarketableSecuritiesMaturitiesAfterOneThroughTwoYearsFairValue
Namespace Prefix:	tern_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Marketable securities maturities with in one year or less fair value.

+ References

No definition available.

+ Details

Name:	tern_MarketableSecuritiesMaturitiesWithInOneYearOrLessFairValue
Namespace Prefix:	tern_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of investment in marketable security.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.4)
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

+ Details

Name:	us-gaap_MarketableSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant