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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2015
Income Taxes [Abstract]  
Summary of company's benefit for income taxes
  Year Ended December 31, 
  2015  2014  2013 
Current-state $3,150  $252  $301 
             
Federal  641,733   (77,986)  74,713 
State  205,426   (10,558)  12,851 
Deferred  847,159   (88,544)  87,564 
Total $850,309  ($88,292) $87,865
Summary of reconciliation of the federal statutory rate

 

    Year Ended December 31,  
    2015     2014     2013  
Computed expected tax expense (benefit)   $ 701,607     ($ 86,853 )   $ 69,788  
State income taxes, net of federal expense (benefit)     32,699       (6,968 )     8,482  
Share-based compensation     (7,524 )     10,201       10,526  
Research and development tax credit     (42,664 )     (19,405 )     (21,887 )
State income tax rate change, net of federal (1)     109,112       0       0  
Other     57,079       14,733       20,956  
   Total income tax (benefit) expense   $ 850,309     ($ 88,292 )   $ 87,865  

 

(1) This impact is due to the actual state tax rate in 2015 being lower than the expected state tax rate used in computing prior deferred taxes.

Schedule of deferred tax asset
  As of December 31, 
  2015  2014 
Product rights $91,344  $130,036 
Property, plant and equipment  (26,717)  225,229 
Federal and state tax credits  339,585   266,078 
Federal net operating loss carryforward  39,241   464,998 
State net operating loss carryforward  0   165,901 
Interest rate swap  28,253   15,486 
Prepaid expenses and other  (19,589)  (6,925)
    Deferred tax asset $452,117  $1,260,803