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Fair Value of Financial Instruments - Schedule of Financial Instruments Measured at Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Contingent consideration $ 12 $ 38 $ 8,717 $ 0 $ 0
Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Contingent consideration 12 38 8,717    
Fair Value, Measurements, Recurring | Level 1          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Contingent consideration 0 0 0    
Fair Value, Measurements, Recurring | Level 2          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Contingent consideration 0 0 0    
Fair Value, Measurements, Recurring | Level 3          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Contingent consideration 12 $ 38 8,717    
Weichai warrant liability | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Weichai warrant liability 24,700        
Weichai warrant liability | Fair Value, Measurements, Recurring | Level 1          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Weichai warrant liability 0        
Weichai warrant liability | Fair Value, Measurements, Recurring | Level 2          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Weichai warrant liability 0        
Weichai warrant liability | Fair Value, Measurements, Recurring | Level 3          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Weichai warrant liability $ 24,700        
Private placement warranty liability | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Weichai warrant liability     1,482 11,036  
Private placement warranty liability | Fair Value, Measurements, Recurring | Level 1          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Weichai warrant liability     0 0  
Private placement warranty liability | Fair Value, Measurements, Recurring | Level 2          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Weichai warrant liability     0 0  
Private placement warranty liability | Fair Value, Measurements, Recurring | Level 3          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Weichai warrant liability     $ 1,482 $ 11,036