Revenue Recognition - Schedule of Revenues, Net (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Total net revenues		$ 1,724	$ 916	$ 4,075	$ 2,509
Revenue Under Previous Guidance [Member]
Total net revenues		1,742		4,128
Difference [Member]
Total net revenues		(18)		(53)
Product Revenue [Member]
Total net revenues		1,648	$ 841	3,822	$ 2,316
Product Revenue [Member] | Revenue Under Previous Guidance [Member]
Total net revenues		1,648		3,822
Product Revenue [Member] | Difference [Member]
Total net revenues
Royalty Revenue [Member] | License Agreement [Member] | Bellco [Member]
Total net revenues		21		79
Royalty Revenue [Member] | License Agreement [Member] | Bellco [Member] | Revenue Under Previous Guidance [Member]
Total net revenues		21		79
Royalty Revenue [Member] | License Agreement [Member] | Bellco [Member] | Difference [Member]
Total net revenues
Royalty Revenue [Member] | Sublicense Agreement [Member] | CamelBak [Member]
Total net revenues				100
Royalty Revenue [Member] | Sublicense Agreement [Member] | CamelBak [Member] | Revenue Under Previous Guidance [Member]
Total net revenues				100
Royalty Revenue [Member] | Sublicense Agreement [Member] | CamelBak [Member] | Difference [Member]
Total net revenues
License Revenue [Member] | License Agreement [Member] | Bellco [Member]
Total net revenues	[1]
License Revenue [Member] | License Agreement [Member] | Bellco [Member] | Revenue Under Previous Guidance [Member]
Total net revenues	[1]	18		53
License Revenue [Member] | License Agreement [Member] | Bellco [Member] | Difference [Member]
Total net revenues	[1]	(18)		(53)
Other Revenue [Member]
Total net revenues		55		74
Other Revenue [Member] | Revenue Under Previous Guidance [Member]
Total net revenues		55		74
Other Revenue [Member] | Difference [Member]
Total net revenues

[1] Under ASC 606, amounts received related to the license under the License Agreement with Bellco would have been recognized as revenue at the time that the license was transferred, which was at the time the payments were received by the Company. Under previous accounting guidance, amounts received under the License Agreement with Bellco were deferred and recognized as revenue over the term of the License Agreement.