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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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