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Quarterly Financial Information (Tables)
12 Months Ended
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]  
Company's Consolidated Quarterly Results of Operations
     1st Quarter     2nd Quarter     3rd Quarter      4th Quarter  
     (in thousands, except per share data)  

2013

         

Revenue

   $ 10,598      $ 12,299      $ 20,232       $ 14,906   

Net income (loss)

     (3,366     (294     6,604         (3,205

Net income (loss) per share, basic

   $ (2.93   $ (0.24   $ 0.14       $ (0.14

Net income (loss) per share, diluted

   $ (2.93   $ (0.24   $ 0.01       $ (0.14

2012

         

Revenue

   $ 20,510      $ 17,435      $ 16,082       $ 9,799   

Net income (loss)

     4,320        3,546        2,601         (2,105

Net income (loss) per share, basic

   $ 0.00      $ 0.00      $ 0.00       $ (1.92

Net income (loss) per share, diluted

   $ 0.00      $ 0.00      $ 0.00       $ (1.92