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Equity Method Investment - Additional Information (Detail) - USD ($) shares in Thousands, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Apr. 01, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Feb. 29, 2016
Equity Method Investments [Line Items] |  |  |  |  |
Joint venture, consideration |  | $ 36,917 | $ 60,904 | $ 27,283 |
Gain (loss) from equity method investment |  | $ (125) | $ (209) | $ (389) |
Bi Pa |  |  |  |  |
Equity Method Investments [Line Items] |  |  |  |  |
Carrying value of equity investment |  |  |  |  | $ 3,283
Cost method ownership percentage |  | 15.00% | 15.00% | 15.00% |
Impairment of investments |  | $ 0 | $ 0 | $ 0 |
Clean Seed Capital Group Ltd |  |  |  |  |
Equity Method Investments [Line Items] |  |  |  |  |
Equity Method Investment Shares Purchased | 6,250 |  |  |  |
Equity investment ownership position | 8.00% |  |  |  |
Joint venture, consideration | $ 1,190 |  |  |  |
Fair value of stock |  | 1,907 |  |  |
Gain (loss) from equity method investment |  | $ 717 |  |  |

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