XML 69 R60.htm IDEA: XBRL DOCUMENT
v3.23.3

FAIR VALUE MEASUREMENTS - Schedule of Non-marketable Equity Investments (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Fair Value Disclosures [Abstract] |  |
Non-marketable securities | $ 9,057 | $ 10,065
Purchases of non-marketable securities | 6,957 |
Changes in fair value | $ (7,965) |

X
- Definition Changes in fair value in non-marketable securities + References No definition available. + Details
Name: | exas_ChangesInFairValue
Namespace Prefix: | exas_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Purchases of non-marketable securities + References No definition available. + Details
Name: | exas_PurchasesOfNonMarketableSecurities
Namespace Prefix: | exas_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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 Value of the not readily marketable security or category which has been determined by management based upon fair value methods, including pricing of similar securities and valuation techniques and is included in the schedule of financial condition or the balance sheet. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 940 -SubTopic 820 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481753/940-820-50-1 + Details
Name: | us-gaap_SecurityOwnedNotReadilyMarketableFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant