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Fair Value of Financial Instruments - Schedule of Inputs of the Black-Scholes Option Pricing Model (Details) - Black-Scholes option pricing model - Level 3	Dec. 31, 2017 $ / shares	Dec. 31, 2015 $ / shares	Dec. 31, 2014 $ / shares
Weichai warrant liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contractual term	1 year
Private placement warranty liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contractual term		6 months 29 days	1 year 4 months
Market value of the Common Stock | Weichai warrant liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Option pricing model input	7.50
Market value of the Common Stock | Private placement warranty liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Option pricing model input		18.25	51.61
Exercise price | Private placement warranty liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Option pricing model input		13.00	13.00
Risk-free interest rate | Weichai warrant liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Option pricing model input	0.018
Estimated price volatility | Weichai warrant liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Option pricing model input	0.95
Estimated price volatility | Private placement warranty liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Option pricing model input		0.55	0.55
Dividend yield | Weichai warrant liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Option pricing model input	0

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- Definition

Value of input used to measure derivative liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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+ References

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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