Inventory - Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Non-current raw materials	$ 1.2	$ 1.2

Represents the noncurrent portion of unprocessed items to be consumed in the manufacturing or production process. Also includes purchased parts that will be used as components of a finished product.

No definition available.

Name:	lnth_InventoryRawMaterialsNoncurrent
Namespace Prefix:	lnth_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant