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CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Preferred Stock | Common Stock | Additional Paid-in Capital | Treasury Stock | Retained Earnings (Accumulated Deficit)
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2013 | $ 47,607 | $ 0 | $ 11 | $ 61,930 | $ (8,685) | $ (5,649)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net (loss) income | 21,477 |  |  |  |  | 21,477
Acquisition consideration, net of tax | 4,379 |  |  | 4,379 |  |
Stock-based compensation expense | 1,409 |  |  | 3,826 | (2,417) |
Stock-based compensation net settlement for withholding taxes | (430) |  |  | (430) |  |
Excess tax benefit from exercise of stock-based awards | 3,298 |  |  | 3,298 |  |
Exercise of private placement warrants | 8,743 |  |  | 8,743 |  |
Ending balance at Dec. 31, 2014 | 86,483 | 0 | 11 | 81,746 | (11,102) | 15,828
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net (loss) income | (2,891) |  |  |  |  | (2,891)
Stock-based compensation expense | 1,278 |  |  | 1,628 | (350) |
Stock-based compensation net settlement for withholding taxes | (351) |  |  | (351) |  |
Excess tax benefit from exercise of stock-based awards | 34 |  |  | 34 |  |
Exercise of private placement warrants | 320 |  |  | 320 |  |
Ending balance at Dec. 31, 2015 | 84,873 | 0 | 11 | 83,377 | (11,452) | 12,937
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net (loss) income | (3,323) |  |  |  |  |
Ending balance at Mar. 31, 2016 | 81,900 |  |  |  |  |
Beginning balance at Dec. 31, 2015 | 84,873 | 0 | 11 | 83,377 | (11,452) | 12,937
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net (loss) income | (32,115) |  |  |  |  |
Ending balance at Jun. 30, 2016 | 55,337 |  |  |  |  |
Beginning balance at Dec. 31, 2015 | 84,873 | 0 | 11 | 83,377 | (11,452) | 12,937
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net (loss) income | (40,832) |  |  |  |  |
Ending balance at Sep. 30, 2016 | 46,967 |  |  |  |  |
Beginning balance at Dec. 31, 2015 | 84,873 | 0 | 11 | 83,377 | (11,452) | 12,937
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net (loss) income | (47,472) |  |  |  |  | (47,472)
Stock-based compensation expense | 1,299 |  |  | 1,428 | (129) |
Stock-based compensation net settlement for withholding taxes | (110) |  |  | (110) |  |
Exercise of private placement warrants | 2,070 |  | 1 | 2,069 |  |
Ending balance at Dec. 31, 2016 | 40,660 | 0 | 12 | 86,764 | (11,581) | (34,535)
Beginning balance at Mar. 31, 2016 | 81,900 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net (loss) income | (28,792) |  |  |  |  |
Ending balance at Jun. 30, 2016 | 55,337 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net (loss) income | (8,717) |  |  |  |  |
Ending balance at Sep. 30, 2016 | 46,967 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net (loss) income | (6,640) |  |  |  |  |
Ending balance at Dec. 31, 2016 | 40,660 | 0 | 12 | 86,764 | (11,581) | (34,535)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net (loss) income | (24,533) |  |  |  |  |
Ending balance at Mar. 31, 2017 | 30,048 |  |  |  |  |
Beginning balance at Dec. 31, 2016 | 40,660 | 0 | 12 | 86,764 | (11,581) | (34,535)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net (loss) income | (32,280) |  |  |  |  |
Ending balance at Jun. 30, 2017 | 18,210 |  |  |  |  |
Beginning balance at Dec. 31, 2016 | 40,660 | 0 | 12 | 86,764 | (11,581) | (34,535)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net (loss) income | (41,482) |  |  |  |  |
Ending balance at Sep. 30, 2017 | 6,129 |  |  |  |  |
Beginning balance at Dec. 31, 2016 | 40,660 | 0 | 12 | 86,764 | (11,581) | (34,535)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net (loss) income | (47,612) |  |  |  |  | (47,612)
Acquisition consideration, net of tax | (712) |  |  | (712) |  |
Stock-based compensation expense | 1,183 |  |  | (860) | 2,043 |
Stock-based compensation net settlement for withholding taxes | (42) |  |  | (42) |  |
Issuance of common stock to Weichai, net of fees | 14,078 |  | 2 | 14,076 |  |
Issuance of Series B convertible preferred stock, net of fees | 0 | 24,617 |  | 0 |  |
Deemed dividend on Series B convertible preferred stock | (37,860) | 37,860 |  | (37,860) |  |
Conversion of Series B convertible preferred stock to common stock | 62,477 | (62,477) | 5 | 62,472 |  |
Ending balance at Dec. 31, 2017 | 32,172 | 0 | 19 | 123,838 | (9,538) | (82,147)
Beginning balance at Mar. 31, 2017 | 30,048 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net (loss) income | (7,747) |  |  |  |  |
Ending balance at Jun. 30, 2017 | 18,210 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net (loss) income | (9,202) |  |  |  |  |
Ending balance at Sep. 30, 2017 | 6,129 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net (loss) income | (6,130) |  |  |  |  |
Ending balance at Dec. 31, 2017 | $ 32,172 | $ 0 | $ 19 | $ 123,838 | $ (9,538) | $ (82,147)

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