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Fair Value Measurements - Estimated Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended
Feb. 29, 2016
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Investment securities:        
Investment securities, restricted, long-term     $ 0 $ 336
Notes Payable:        
Short-term borrowings, net of discount and deferred loan costs, related party     0 12,676
Affiliated Entity        
Notes Payable:        
Extinguishment of debt, amount $ 300 $ 300    
Carrying Value        
Investment securities:        
Investment securities, restricted, long-term     0 336
Cost method investment     1,016 2,776
Notes Payable:        
Short-term borrowings, net of discount and deferred loan costs, related party     0 12,676
Current portion of notes payable, related parties     0 1,837
Long-term portion of notes payable, related parties     0 13,512
Highview technology license payable     207 519
Highview technology license payable, long-term     0 1,038
Stock appreciation rights, liability-classified equity award     0 742
Fair Value        
Investment securities:        
Investment securities, restricted, long-term     0 336
Cost method investment     1,016 2,776
Notes Payable:        
Short-term borrowings, net of discount and deferred loan costs, related party     0 12,676
Current portion of notes payable, related parties     0 1,457
Long-term portion of notes payable, related parties     0 13,273
Highview technology license payable     207 519
Highview technology license payable, long-term     0 1,038
Stock appreciation rights, liability-classified equity award     $ 0 $ 742