Sale of Assets - Additional Information (Detail) - Asset Purchase Agreement [Member] - Ferring [Member] - ZOMAJET [Member] $ in Thousands	1 Months Ended
	Oct. 31, 2017 USD ($) Installment	Feb. 28, 2018 USD ($)
Sale Of Assets [Line Items]
Total purchase price	$ 14,500
Number of installments paid for purchase price | Installment	4
Description of purchase price payment	The purchase price is to be paid in four installments consisting of the following: a $2.0 million upfront payment, which was received upon entry into the Asset Purchase Agreement and the transfer of certain assets; a second installment of $2.75 million received upon delivery of certain documentation and satisfaction of certain conditions primarily related to product manufacturing, which occurred in February 2018; a third installment of $4.75 million payable upon satisfaction of certain conditions, including further document transfer, the successful completion of a regulatory audit by a notified body, and a pilot manufacturing run under Ferring’s supervision; and a final installment of $5.0 million upon Ferring’s receipt of the CE Mark needed to continue to commercialize the product in certain territories and the final transfer of certain product-related inventory, equipment and agreements to Ferring (the “Completion Date”), which is expected to occur by the end of 2018.
Upfront payment received upon transfer of assets	$ 2,000
Consideration receivable on criteria completion related to Audit and pilot manufacturing	4,750
Consideration receivable on criteria completion related to Product commercialization	$ 5,000
Subsequent Event [Member]
Sale Of Assets [Line Items]
Consideration receivable on criteria completion related to product manufacturing		$ 2,750