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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Apr. 30, 2016	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accounting Policies [Abstract]
Accounts receivable written off				$ 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		$ 400,000	$ 400,000	739,000	$ 738,000
Estimated future amortization expense, remainder of 2019		800,000		800,000
Estimated future amortization expense, 2020		1,500,000		1,500,000
Estimated future amortization expense, 2021		$ 1,000,000.0		$ 1,000,000.0

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Regulatory milestone payment.

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Amount of direct write-downs of accounts receivable charged against the allowance.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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