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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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