content_image/274199.jpg content_image/274201.jpg content_image/274202.jpg content_image/274203.jpg content_image/274204.jpg
(3) receivables 

Receivables consist of the following (in thousands): 

<img src='content_image/274199.jpg'>

Receivables are written off against these reserves in the period they are determined to be uncollectible, and payments subsequently received on previously written-off receivables are recorded as a reversal of the bad debt provision. the Company performs credit evaluations on its customers and obtains credit insurance on a large percentage of its accounts, but does not generally require collateral. the Company recorded a provision for doubtful accounts of approximately $171,000 and $32,000 for the years ended December 31, 2014 and 2013, respectively. 

(4) inventories 

Inventories consist of the following (in thousands): 

<img src='content_image/274201.jpg'>

(5) other intangible assets 

the carrying values of the Company’s definite-lived intangible assets as of December 31, 2014 and 2013, are as follows (in thousands): 

<img src='content_image/274202.jpg'>

Amortization expense related to intangible assets was approximately $393,000, $478,000 and $164,000, respectively, for the years ended December 31, 2014, 2013 and 2012. Future amortization for the years ending December 31 will be approximately (in thousands): 

(6) Property, Plant, and equipment 

property, plant, and equipment consist of the following (in thousands): 

<img src='content_image/274203.jpg'>

<img src='content_image/274204.jpg'>

Depreciation and amortization expense for the years ended December 31, 2014, 2013 and 2012, were approximately $4.0 million, $3.6 million and $2.8 million, respectively. 

