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Fair value of financial instruments (Tables) | 9 Months Ended
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Sep. 30, 2015
Estimated Fair Value of Private Placement Warrants Publicly Traded Stock Pricing Approach | As of September 30, 2015 and December 31, 2014, the Company estimated the fair value of its liability for Private Placement Warrants with a publicly traded stock pricing approach using the Black-Scholes option pricing model. The inputs of the Black-Scholes option pricing model included the following:
|  | September 30, 2015 |  |  | December 31, 2014 |
Market value of the Company’s common stock |  | $ | 22.71 |  |  | $ | 51.61 |
Exercise price |  | $ | 13.00 |  |  | $ | 13.00 |
Risk-free interest rate |  |  | 0.12 | % |  |  | 0.39 | %
Estimated price volatility |  |  | 55.00 | % |  |  | 55.00 | %
Contractual term |  |  | 0.58 years |  |  |  | 1.33 years |
Dividend yield |  |  | — |  |  |  | — |
Summary of Change in Estimated Fair Value of Company's Level 3 Financial Instrument | The following table summarizes the change in the estimated fair value of the Company’s Level 3 Private Placement Warrants liability in the nine months ended September 30, 2015:
Balance at December 31, 2014 |  | $ | 11,036 |
Fair value of private placement warrants exercised |  |  | (255 | )
Change in the value of private placement warrants |  |  | (8,040 | )
Balance at September 30, 2015 |  | $ | 2,741 |
Financial Liability Measured at Fair Value on Recurring Basis | The following table summarizes fair value measurements by level as of September 30, 2015, for the Company’s level 3 financial liabilities measured at fair value on a recurring basis:
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Private placement warrants liability |  |  | — |  |  |  | — |  |  | $ | 2,741 |
Contingent consideration |  |  | — |  |  |  | — |  |  |  | 8,690 |
The following table summarizes fair value measurement by level as of December 31, 2014, for the Company’s level 3 financial liability measured at fair value on a recurring basis:
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Private placement warrants liability |  |  | — |  |  |  | — |  |  | $ | 11,036 |
Contingent Consideration [Member] |
Summary of Change in Estimated Fair Value of Company's Level 3 Financial Instrument | The following table summarizes the change in the estimated fair value of the Company’s Level 3 contingent consideration liability in the nine months ended September 30, 2015:
Balance at December 31, 2014 |  | $ | — |
Powertrain Date of Acquisition |  |  | 8,200 |
Bi-Phase Date of Acquisition |  |  | 540 |
Change in the value of contingent consideration |  |  | (50 | )
Balance at September 30, 2015 |  | $ | 8,690 |

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- Definition Tabular disclosure of liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=36462937&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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