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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2023 USD ($) | Apr. 30, 2016 USD ($) | Dec. 31, 2023 USD ($) Customer Segment shares | Dec. 31, 2022 USD ($) Customer shares | Dec. 31, 2021 USD ($) shares
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |
Charge on finished goods inventory |  |  | $ 900 | $ 600 | $ 1,300
Impairment losses |  |  | 0 |  |
Finite-lived intangible assets, net |  |  | 65,490 | 0 |
Amortization of intangible assets |  |  | 4,093 | 0 | 1,108
Impairment Of Intangible Assets Finite lived |  |  | 0 | 0 |
Advertising costs |  |  | 9,400 | 5,500 | 41,800
Advertising costs capitalized as prepaid expenses |  |  | $ 0 | $ 0 |
Number of large customers | Customer |  |  | 4 | 4 |
Stock-based compensation expenses |  |  |  |  | $ 6,800
Antidilutive securities to purchase common stock | shares |  |  | 21,264,000 | 21,185,000 | 17,535,000
Number of business segments | Segment |  |  | 1 |  |
License Agreements |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |
Finite-lived intangible assets, net | $ 40,000 |  |  |  |
Amortization of intangible assets |  |  | $ 2,400 |  |
Estimated future amortization expense, 2021 |  |  | 3,100 |  |
License Agreements | Neuren |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |
One-time contingent regulatory milestone payment pursuant to agreement with Ipsen Group | 40,000 |  |  |  |
Finite-lived intangible assets, net | $ 29,600 |  |  |  |
Amortization of intangible assets |  |  | 1,700 |  |
Estimated future amortization expense, 2021 |  |  | 2,300 |  |
License Agreements | Ipsen |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |
One-time contingent regulatory milestone payment pursuant to agreement with Ipsen Group |  | $ 8,000 |  |  |
Finite-lived intangible assets, net |  | $ 8,000 |  |  |
Amortization of intangible assets |  |  | $ 0 | $ 0 | $ 1,100
Customer Concentration Risk | Revenue, Product and Service Benchmark | Four Customers |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 69.00% | 73.00% |
Customer Concentration Risk | Accounts Receivable | Four Customers |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 73.00% | 74.00% |

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