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Accrued Liabilities
 12 Months Ended
Dec. 31, 2013
Payables and Accruals [Abstract]  
Accrued Liabilities
Accrued Liabilities
Accrued liabilities consisted of the following (in thousands):
December 31:
 
2013
 
2012
Payroll and related
 
$
9,537

 
$
7,653

Professional fees
 
1,400

 
1,916

Non-income taxes
 
3,223

 
84

Product warranty
 
578

 
1,006

Deferred rent
 
278

 
380

Derivative litigation costs
 
—

 
1,262

Derivative litigation settlement
 
1,241

 
1,573

Other
 
3,206

 
2,778

Total
 
$
19,463

 
$
16,652



Total derivative litigation cost in excess of insurance limits was $1.9 million through December 31, 2013. Accrued settlement costs represent the estimated fair value of warrants that are to be issued. See Note 10, Commitments and Contingencies and Note 19, Subsequent Event.