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Fair Value Measurements - Estimated Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Investment securities:          
Investment securities $ 0 $ 105 $ 105 $ 105 $ 105
Investment securities, restricted 0 406 406 406 406
Investment securities, restricted, long-term 336 332 $ 1,134 $ 2,637 $ 2,634
Carrying Value          
Investment securities:          
Investment securities 0 105      
Investment securities, restricted 0 406      
Investment securities, restricted, long-term 336 332      
Cost method investment 2,776 0      
Notes Payable:          
Current portion of notes payable, related parties 1,479 0      
Long-term portion of notes payable, related parties 14,431 0      
Highview technology license payable 155 0      
Highview technology license payable, long-term 1,389 0      
Fair Value          
Investment securities:          
Investment securities 0 105      
Investment securities, restricted 0 406      
Investment securities, restricted, long-term 336 332      
Cost method investment 2,776 0      
Notes Payable:          
Current portion of notes payable, related parties 1,439 0      
Long-term portion of notes payable, related parties 14,356 0      
Highview technology license payable 155 0      
Highview technology license payable, long-term $ 1,389 $ 0