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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Schedule of Fair Value Measurements at Reporting Date
The Base and Additional Earn-outs were paid in cash during 2016, as discussed below in Contingent Consideration section.
(in thousands)
 
As of December 31, 2017
 
 
Carrying Value
 
Fair Value

 
 
Level 1
 
Level 2
 
Level 3
Weichai warrant liability
 
$
24,700

 
$

 
$

 
$
24,700

Contingent consideration
 
12

 

 

 
12

(in thousands)
 
As of December 31, 2016
 
 
Carrying Value
 
Fair Value
 
 
 
Level 1
 
Level 2
 
Level 3
Contingent consideration
 
$
38

 
$

 
$

 
$
38

(in thousands)
 
As of December 31, 2015
 
 
Carrying Value
 
Fair Value (Restated)
 
 
(Restated)
 
Level 1
 
Level 2
 
Level 3
Private placement warranty liability
 
$
1,482

 
$

 
$

 
$
1,482

Contingent consideration
 
8,717

 

 

 
8,717

(in thousands)
 
As of December 31, 2014
 
 
Carrying Value
 
Fair Value (Restated)
 
 
(Restated)
 
Level 1
 
Level 2
 
Level 3
Private placement warranty liability
 
$
11,036

 
$

 
$

 
$
11,036

(in thousands)
 
As of December 31, 2017
 
 
Carrying Value
 
Fair Value

 
 
Level 1
 
Level 2
 
Level 3
Wells Fargo revolving credit facility
 
$
37,055

 
$

 
$
37,055

 
$

Unsecured Senior Notes
 
55,000

 

 

 
50,000

(in thousands)
 
As of December 31, 2016
 
 
Carrying Value
 
Fair Value
 
 
 
Level 1
 
Level 2
 
Level 3
Wells Fargo revolving credit facility
 
$
12,774

 
$

 
$
12,774

 
$

Unsecured Senior Notes
 
55,000

 

 

 
49,800

TPG Term Loan
 
71,400

 

 

 
70,800

(in thousands)
 
As of December 31, 2015
 
 
Carrying Value
 
Fair Value (Restated)
 
 
(Restated)
 
Level 1
 
Level 2
 
Level 3
Wells Fargo revolving credit facility
 
$
97,299

 
$

 
$
97,299

 
$

Unsecured Senior Notes
 
55,000

 

 

 
55,000

(in thousands)
 
As of December 31, 2014
 
 
Carrying Value
 
Fair Value (Restated)
 
 
(Restated)
 
Level 1
 
Level 2
 
Level 3
Wells Fargo revolving credit facility
 
$
78,030

 
$

 
$
78,030

 
$

Wells Fargo Term Loan
 
4,028

 

 
4,028

 

Summary of Change in the Estimated Fair Value of Private Placement Warrants
The following table summarizes the change in the estimated fair value of the Company’s contingent consideration, primarily for Powertrain in 2016 and 2015 and for 3PI in 2014.
(in thousands)
For the Year Ended December 31,
 
2017
 
2016
 
2015 (Restated)
 
2014 (Restated)
Balance at beginning of year
$
38

 
$
8,717

 
$

 
$

Initial estimate of contingent consideration liability

 

 
8,740

 
3,840

Increase (decrease) in value reflected in income 1

 
(230
)
 
(23
)
 
(3,840
)
Payment of contingent consideration 2
(26
)
 
(8,449
)
 



Balance at end of year
$
12

 
$
38

 
$
8,717

 
$

Less: Noncurrent portion

 
12

 
442

 

Short-term contingent consideration at end of year
$
12

 
$
26

 
$
8,275

 
$

1.
Includes $0.1 million of interest on contingent consideration recorded in Interest expense on the Consolidated Statement of Operations.
2.
Includes $0.1 million of cash paid in excess of the initial fair value estimate of contingent consideration at the time of the Powertrain acquisition and presented in Other, net within cash flows from operating activities in the Consolidated Statement of Cash Flows.
The following table summarizes changes in the estimated fair value of the Company’s warrant liability:
(in thousands)
 
As of December 31,
 
 
2017
 
2016
 
2015
 
2014
 
 
 
 
 
 
(Restated)
 
(Restated)
Balance at beginning of year
 
$

 
$
1,482

 
$
11,036

 
$
24,525

Exercise of private placement warrants
 

 
(69
)
 
(255
)
 
(7,320
)
Issuance of warrants
 
20,700

 

 

 

Increase (decrease) in value*
 
4,000

 
(1,413
)
 
(9,299
)
 
(6,169
)
Balance at end of year
 
$
24,700

 
$

 
$
1,482

 
$
11,036

*
Loss (gain) related to the change in fair value of the warrants for each year are presented as Loss (gain) from change in fair value of warrants in the Company's Consolidated Statements of Operations.
Schedule of Inputs of the Black-Scholes Option Pricing Model
The inputs of the Black-Scholes option pricing model were as follows:
 
 
As of December 31,
Assumptions
 
2015
 
2014
Closing price of the Common Stock
 
$18.25
 
$51.61
Exercise price
 
$13.00
 
$13.00
Estimated price volatility*
 
55
%
 
55
%
Contractual term
 
0.58 years

 
1.33 years

*    Represents the upper end of the range of implied volatility of publicly traded call options of benchmark companies.
The inputs of the Black-Scholes option pricing model were as follows:
Assumptions
 
December 31, 2017
Market value of the Common Stock
 
$7.50
Exercise price
 
varies

Risk-free interest rate
 
1.8
%
Estimated price volatility
 
95
%
Contractual term
 
1.0 year

Dividend yield