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Accrued Liabilities
 12 Months Ended
Dec. 31, 2015
Payables and Accruals [Abstract]  
Accrued Liabilities
8. Accrued Liabilities

Accrued liabilities consisted of the following at December 31 (in thousands):

 

     2015      2014  

Employee compensation

    $ 8,039       $ 6,838   

Royalties payable

      828         632   

Construction related costs for leasehold improvements

      640         50   

Clinical study costs

      563         572   

Sales, use and other taxes

      551         543   

Warranty reserves

      299         503   

Accounting and legal

      427         297   

Other accrued liabilities

      834         968   
  

 

 

     

 

 

  
   $ 12,181       $ 10,403