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Significant Accounting Policies - Calculation of Net Loss and Number of Shares Used to Compute Basic and Diluted Net Loss per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Loss Earnings Per Share [Line Items]        
Net loss - basic $ (19,311) $ (5,140) $ (53,331) $ (106,659)
Net loss - diluted $ (19,311) $ (5,140) $ (53,331) $ (106,659)
Weighted average shares outstanding-basic 408,417 404,614 407,489 399,944
Weighted average shares outstanding-diluted 408,417 404,614 407,489 399,944
Net loss per share basic [1] $ (0.05) $ (0.01) $ (0.13) $ (0.27)
Net loss per share-diluted [1] $ (0.05) $ (0.01) $ (0.13) $ (0.27)
[1] Excluding the licensing revenue change in estimate and Medicaid change in estimate, both discussed in Note 7 – Revenue Recognition, net loss per share basic and diluted for the three and nine months ended September 30, 2023 would have been $(0.06) and $(0.19), respectively.