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Significant Accounting Policies - Calculation of Net Income (Loss) and Number of Shares Used to Compute Basic and Diluted Net Earnings (Loss) per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Earnings Loss Per Share [Line Items] |  |  |  |
Net income (loss)-basic and diluted | $ 7,808 | $ 4,415 | $ 6,182 | $ (16,138)
Weighted average shares outstanding-basic | 395,899 | 384,663 | 395,272 | 373,300
Effect of dilutive securities: |  |  |  |
Preferred stock, if converted |  | 6,989 |  |
Weighted average shares outstanding-diluted | 401,767 | 399,664 | 402,778 | 373,300
Net earnings (loss) per share-basic | $ 0.02 | $ 0.01 | $ 0.02 | $ (0.04)
Net earnings (loss) per share-diluted | $ 0.02 | $ 0.01 | $ 0.02 | $ (0.04)
Stock Options |  |  |  |
Effect of dilutive securities: |  |  |  |
Effect of dilutive securities | 4,212 | 6,372 | 4,993 |
Restricted Stock and Restricted Stock Units |  |  |  |
Effect of dilutive securities: |  |  |  |
Effect of dilutive securities | 1,656 | 1,640 | 2,513 |

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