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Summary of Significant Accounting Policies - Additional Information (Detail) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2016 USD ($) | Dec. 31, 2020 USD ($) Customer Segment shares | Dec. 31, 2019 USD ($) Customer shares | Dec. 31, 2018 USD ($) Customer shares
Summary Of Significant Accounting Policy [Line Items] |  |  |  |
Charge on finished goods inventory |  | $ 400,000 | $ 1,100,000 | $ 2,700,000
Impairment losses |  | 0 |  |
One-time contingent regulatory milestone payment pursuant to agreement with Ipsen Group | $ 8,000,000.0 |  |  |
Finite-lived intangible assets, net | $ 8,000,000.0 |  |  |
Amortization of intangible assets |  | 1,477,000 | 1,477,000 | 1,476,000
Estimated future amortization expense, 2021 |  | 1,100,000 |  |
Advertising costs |  | 51,100,000 | 38,300,000 | $ 39,800,000
Advertising costs capitalized as prepaid expenses |  | $ 0 | $ 0 |
Number of large customers | Customer |  | 4 | 4 | 4
Antidilutive securities to purchase common stock | shares |  | 19,331,000 | 19,516,000 | 20,824,000
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% | 77.00% | 85.00%
Customer Concentration Risk | Accounts Receivable | Four Customers |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |
Concentration risk, percentage |  | 75.00% | 75.00% | 84.00%

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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