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Fair Value of Financial Instruments (Tables) | 12 Months Ended
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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 |  | — |

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19279-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=99377789&loc=SL7498348-110258 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19279-110258 + Details
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