Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	6 Months Ended	12 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Accounting Policies [Abstract]
Significant product expenses	$ 0	$ 0
Capitalized inventories	$ 0		$ 0

Expensed cost of inventories with no regulatory approval.

No definition available.

Name:	lnth_ExpensedCostOfInventoriesWithNoRegulatoryApproval
Namespace Prefix:	lnth_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration