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Inventory
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Inventory Inventory
As of December 31, 2018, the Company's inventory balance consists of the following (in thousands):
 
As of December 31,
2018
Raw materials
$
2,145

Work-in-process
4,567

Finished goods
320

 
$
7,032


Inventory is stated at the lower of cost or net realizable value and consists of raw materials, work-in-process and finished goods. Cost is determined using a standard cost method, which approximates actual cost, and assumes a FIFO flow of goods. The Company began capitalizing inventory costs following FDA approval of ARIKAYCE on September 28, 2018. The Company has not recorded any inventory write downs since that time. The Company currently uses a limited number of third-party contract manufacturing organizations (CMOs) to produce its inventory.