Sale of Assets - Additional Information (Details) - USD ($) $ in Thousands		12 Months Ended
May 05, 2017	Dec. 31, 2017
Sale Of Assets [Line Items]
Net gain on sale of assets		$ 856
Inventory and intellactual property \| Third Party
Sale Of Assets [Line Items]
Agreement to sell assets, consideration payable in credit to future minimum royalties owed	$ 1,000
Net gain on sale of assets	$ 900

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/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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