Sale of Assets - Schedule of Gain on Sale of Assets (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($)
Sale Of Assets [Line Items]
Net book value of patents transferred	$ 108
Gain on sale of assets	860
Asset Purchase Agreement [Member] \| Ferring [Member] \| ZOMAJET [Member]
Sale Of Assets [Line Items]
Proceeds from sale of assets	2,000
Net book value of molds and equipment transferred	933
Net book value of patents transferred	108
Payment of transaction costs	99
Gain on sale of assets	$ 860

Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2443-110228

Name:	us-gaap_GainLossOnDispositionOfAssets1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration