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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2016 USD ($) | Dec. 31, 2021 USD ($) Segment Customer shares | Dec. 31, 2020 USD ($) Customer shares | Dec. 31, 2019 USD ($) Customer shares
Summary Of Significant Accounting Policy [Line Items] |  |  |  |
Charge on finished goods inventory |  | $ 1,300 | $ 400 | $ 1,100
Impairment losses |  | 0 |  |
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 |  | 1,108 | 1,477 | 1,477
Advertising costs |  | 41,800 | 51,100 | $ 38,300
Advertising costs capitalized as prepaid expenses |  | $ 0 | $ 0 |
Number of large customers | Customer |  | 4 | 4 | 4
Stock-based compensation expenses |  | $ 6,800 |  |
Antidilutive securities to purchase common stock | shares |  | 17,535,000 | 19,331,000 | 19,516,000
Number of business segments | Segment |  | 1 |  |
Customer Concentration Risk | Revenue, Product and Service Benchmark | Four Customers |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |
Concentration risk, percentage |  | 74.00% | 74.00% | 77.00%
Customer Concentration Risk | Accounts Receivable | Four Customers |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |
Concentration risk, percentage |  | 77.00% | 75.00% | 75.00%

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