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Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2014
Intangible Assets  
Schedule of gross carrying amount and related accumulated amortization of the intangible assets

The following sets forth the gross carrying amount and related accumulated amortization of these intangible assets, in thousands:

 

 

 

 

 

March 31, 2014

 

 

 

 

 

 

 

 

 

(unaudited)

 

December 31, 2013

 

 

 

Weighted-

 

Gross Carrying

 

Accumulated

 

Gross Carrying

 

Accumulated

 

 

 

Average Life

 

Amount

 

Amortization

 

Amount

 

Amortization

 

 

 

 

 

 

 

 

 

 

 

 

 

Purchased patents

 

10.0

 

$

2,292

 

$

1,896

 

$

2,292

 

$

1,838

 

Patent defense costs(1)

 

 

 

$

1,761

 

$

—

 

$

704

 

$

—

 

 

(1)           Amortization of capitalized patent defense costs will begin upon successful outcome of the on-going litigation.  Three U.S. patents have been issued covering Oxtellar XR, providing patent protection through 2027.