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ORGANIZATION, BASIS OF PRESENTATION, AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Increase in revenues | $ 57,763 | $ 21,958 | $ 92,392 | $ 47,577 |  |
Decrease in net loss | 1,508 | 27,361 | 80,447 | 99,920 |  |
Letter of credit established as a deposit | 1,500 |  | 1,500 |  |  |
Cash and cash equivalents | 259,393 | 114,291 | 259,393 | 114,291 | $ 80,428 | $ 140,418
Current restricted cash | 0 | 2,000 | 0 | 2,000 | 0 | 0
Non-current restricted cash | 1,500 | 1,500 | 1,500 | 1,500 | 1,500 | 3,500
Cash, cash equivalents and restricted cash as reported within the accompanying Condensed Consolidated Statements of Cash Flows | 260,893 | 117,791 | 260,893 | 117,791 | $ 81,928 | $ 143,918
Biogen MA, Inc. |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Increase in revenues | $ 9,621 | $ 0 | $ 17,799 | $ 0 |  |
Biogen MA, Inc. | Customer Concentration Risk | Revenue Benchmark |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Concentration risk, percentage | 16.00% | 0.00% | 19.00% | 0.00% |  |
Kite Pharma Inc |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Increase in revenues | $ 7,294 | $ 8,861 | $ 21,935 | $ 26,233 |  |
Kite Pharma Inc | Customer Concentration Risk | Revenue from Contract with Customer |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Concentration risk, percentage | 13.00% | 40.00% | 24.00% | 55.00% |  |
Pfizer |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Increase in revenues | $ 9,200 | $ 468 | $ 12,985 | $ 1,538 |  |
Pfizer | Customer Concentration Risk | Revenue from Contract with Customer |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Concentration risk, percentage | 68.00% | 16.00% | 51.00% | 11.00% |  |
Sanofi |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Increase in revenues | $ 1,498 | $ 2,754 | $ 3,789 | $ 7,763 |  |
Sanofi | Customer Concentration Risk | Revenue from Contract with Customer |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Concentration risk, percentage | 3.00% | 40.00% | 4.00% | 29.00% |  |
Change in Collaboration Agreement Scope | Collaboration Agreement | Pfizer |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Increase in revenues | $ 5,800 |  |  |  |  |
Decrease in net loss | $ 5,800 |  |  |  |  |
Earnings per share, basic (in dollars per share) | $ 0.04 |  |  |  |  |
Change in Collaboration Agreement Scope | Collaboration Agreement | Pfizer and Sanofi |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Increase in revenues |  |  | $ 8,900 |  |  |
Decrease in net loss |  |  | $ 8,900 |  |  |
Earnings per share, basic (in dollars per share) |  |  | $ 0.06 |  |  |

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