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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) Segment Integer | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jan. 01, 2022 USD ($) | Dec. 31, 2018 USD ($)
Short term deposits, Interest rate | 0.60% | 1.20% |  |  |
Accounts receivable, Allowance for credit loss, Writeoff | $ 0 | $ 0 | $ 0 |  |
Accounts receivable, Allowance for credit loss, Current | 0 | 0 |  |  |
Impairement Loss On Long-Lived Assets | $ 0 | 0 | 0 |  |
Monthly Deposits Of Employees(In%) | 8.33% |  |  |  |
Severance Payment Calculation, Description | The Chinese subsidiary liability for severance pay for its local employees is calculated in accordance with the Chinese law. The severance payment is calculated as the product of A x B, where A is the lower of a) most recent monthly salary paid to employees or b) cap of RMB 24,633 (approximately $3,900), and B is the length of employment in the Company (years). |  |  |  |
Deferred Revenue Recognized During Period | $ 76 | 0 |  |  |
Equity Investment, Amount | $ 17 | 35 |  |  |
Number Of Operating Segments | Segment | 2 |  |  |  |
Number Of Market | Integer | 2 |  |  |  |
No Loss Allocated To Participating Securities | $ 0 |  |  |  |
Cash and Cash Equivalents | 56,791 | 26,316 | 15,556 |  | $ 26,043
Short term Deposits, Value | 117,568 | 35,254 |  |  |
Accounting Standards Update 2016-02 [Member] | Subsequent Event [Member] |  |  |  |  |
Operating Lease Liability |  |  |  | $ 5,000 |
Selling and Marketing Expense [Member] |  |  |  |  |
Internal Sales Commissions Recorded In Sales And Marketing Expense | 790 | 412 | $ 509 |  |
Material Rights [Member] |  |  |  |  |
Deferred Revenue for Material Rights | $ 54 | $ 76 |  |  |
Greater Than Twelve Month [Member] |  |  |  |  |
Contractual term of right of use asset | 12 months |  |  |  |
Equal To Or Less Than Twelve Month [Member] |  |  |  |  |
Contractual term of operating leases | 12 months |  |  |  |
Less Than Twelve Month [Member] |  |  |  |  |
Contractual term of Short term lease | 12 months |  |  |  |
Maximum [Member] |  |  |  |  |
Short term deposits, Maturity term | 1 year |  |  |  |
Minimum [Member] |  |  |  |  |
Short term deposits, Maturity term | 3 months |  |  |  |

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