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ORGANIZATION, BASIS OF PRESENTATION, AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Revenues | $ 27,872,000 | $ 21,553,000 | $ 54,152,000 | $ 34,629,000
Net loss | $ (47,174,000) | $ (35,965,000) | $ (93,113,000) | $ (78,939,000)
Earnings per share, basic (in dollars per share) | $ (0.33) | $ (0.26) | $ (0.65) | $ (0.62)
Impairment of goodwill or indefinite-lived intangible assets |  |  | $ 0 |
Impairment of long-lived assets |  |  | 0 |
Letter of credit established as a deposit | $ 1,500,000 |  | 1,500,000 |
Pfizer SB-525 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Revenues | $ 0 |  | $ 0 |
Pfizer SB-525 | Change in collaboration agreement scope | Collaboration agreement |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Revenues |  |  |  | $ 3,100,000
Net loss |  |  |  | $ 3,100,000
Earnings per share, basic (in dollars per share) |  |  |  | $ 0.02

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