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BUSINESS COMBINATIONS AND ASSET ACQUISITIONS - Business Combinations Textual (Details) $ / shares in Units, $ in Thousands |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 19 Months Ended |  |
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Jun. 23, 2021 USD ($) | Apr. 14, 2021 USD ($) $ / shares shares | Jan. 05, 2021 USD ($) $ / shares shares | Mar. 03, 2020 USD ($) | Jan. 31, 2021 shares | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Sep. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Mar. 03, 2021 USD ($) | Dec. 31, 2020 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  | $ 363,647 |  |  |  |  | $ 363,647 | $ 363,647 |  | $ 363,647 |  | $ 2,477
Stock-based compensation expense |  |  |  |  |  | 63,600 |  |  | $ 41,500 |  | 283,300 |  | $ 111,100 |  |  |
Business combination, equity interest in acquiree, remeasurement gain |  |  |  |  |  |  |  |  |  |  | 30,500 |  | 0 |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  | 197,180 |  | 111,075 |  |  |
Cash payments to acquire business, net of cash acquired |  |  |  |  |  |  |  |  |  |  | 415,549 |  | 6,658 |  |  |
Issuance of common stock for business combination and asset acquisition |  |  |  |  |  |  | $ 16,120 | $ 1,254,798 | $ 250 | $ 28,597 | 1,270,918 |  | 28,847 |  |  |
Equity interests issued or issuable to previous investors |  |  |  | $ 8,400 |  |  |  |  |  |  |  |  |  |  |  |
Thrive |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment owned, at fair value |  |  | $ 12,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, equity interest in acquiree, remeasurement gain |  |  |  |  |  |  |  |  |  |  |  |  | 7,600 |  |  |
Change in amount of contingent consideration liability |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,500 |  |  |
Investment Income | Thrive |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, equity interest in acquiree, remeasurement gain |  |  |  |  |  |  |  | 30,500 |  |  |  |  |  |  |  |
Ashion Analytics |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  | $ 109,999 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, equity interest issued or issuable (in shares) | shares |  | 125,444 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued, price per share (in usd per share) | $ / shares |  | $ 129.33 |  |  |  |  |  |  |  |  |  |  |  |  |  |
In-process research and development (IPR&D) |  | $ 39,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average remaining useful life of finite-lived intangible asset (in years) |  | 13 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  |  |  |  |  |  | 1,600 |  |  |  |  |
Fair value of stock issued in acquisition |  | $ 16,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  | 16,224 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | 74,775 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ashion Analytics | Commercial Launch Milestone |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional cash consideration to be paid |  | 20,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  | 19,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ashion Analytics | MRD Product Revenue Milestone |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  | 30,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue milestone |  | $ 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Thrive |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  |  | $ 2,187,054 |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, equity interest issued or issuable (in shares) | shares |  |  | 9,323,266 |  | 9,300,000 |  |  |  |  |  |  |  |  |  |  |
Shares issued, price per share (in usd per share) | $ / shares |  |  | $ 127.79 |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  | $ 450,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  |  |  | 10,300 |  |  | 10,300 |  |  |  |  |
Fair value of stock issued in acquisition |  |  | 1,190,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  |  | 1,175,431 |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire businesses and accelerated vesting of awards |  |  | 590,200 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  | 584,996 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  | 166,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation consideration assumed |  |  | 197,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation consideration assumed and allocated to consideration transferred |  |  | 52,200 |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation consideration assumed and deemed compensatory |  |  | 144,800 |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated vesting compensation expense |  |  | 65,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation expense |  |  | $ 79,800 |  |  |  |  |  |  |  |  |  |  |  |  |
Share conversion ratio (share per share) |  |  | 0.06216 |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, pro forma loss |  |  |  |  |  | 39,600 |  |  |  |  |  | 219,600 |  |  |  |
Stock-based compensation |  |  |  |  |  | 4,500 |  |  |  |  | 19,000 |  |  |  |  |
Additional benefit charges |  |  |  |  |  | 1,200 |  |  |  |  | 3,900 |  |  |  |  |
Thrive | Employees with Qualifying Termination Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated vesting compensation expense |  |  |  |  |  |  |  | 13,500 |  |  |  |  |  |  |  |
Thrive | Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  | $ 352,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Thrive | General and Administrative Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental share based compensation expense |  |  | 16,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  | 5,200 |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated vesting compensation expense |  |  |  |  |  |  |  | $ 86,200 |  |  |  |  |  |  |  |
Thrive | FDA Approval |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  | 150,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Thrive | CSM Coverage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Thrive | Allocated to Consideration Transferred | Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  | 331,300 |  |  |  |  |  |  |  |  |  |  |  |  |
Thrive | Allocated to Previous Ownership Interest | Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  | 6,400 |  |  |  |  |  |  |  |  |  |  |  |  |
Thrive | Allocated to Compensation | Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  | 14,300 |  |  |  |  |  |  |  |  |  |  |  |  |
Thrive | Compensation Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent payment obligations |  |  | $ 18,200 |  |  |  |  |  |  |  |  |  |  |  |  |
Paradigm & Viomics |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  |  |  | 40,400 |  |  |  |  |  |  |  |  |  |  |  |
In-process research and development (IPR&D) |  |  |  | 7,800 |  |  |  |  |  |  |  |  |  |  | $ 7,800 |
Common stock issued |  |  |  | 32,200 |  |  |  |  |  |  |  |  |  |  |  |
Cash payments to acquire business, net of cash acquired |  |  |  | $ 8,200 |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock for business combination and asset acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  | 28,800 |  |
Amount of shares held for future issuance |  |  |  |  |  | $ 3,400 |  |  |  |  | $ 3,400 | $ 3,400 |  | $ 3,400 |  |
Equity interests issued or issuable to previous investors, vesting period |  |  |  | 4 years |  |  |  |  |  |  |  |  |  |  |  |
Paradigm & Viomics | Acquired developed technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average remaining useful life of finite-lived intangible asset (in years) |  |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |  |
PFS Genomics |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price | $ 33,569 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
In-process research and development (IPR&D) | $ 33,074 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Fair value at acquisition-date of the assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interests issued by the acquirer, including but not limited to, instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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