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CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' (DEFICIT) EQUITY - USD ($)
$ in Thousands
Total
Series B Convertible Preferred Stock
Common Stock
Additional Paid-in Capital
Treasury Stock
Accumulated Deficit
Beginning balance at Dec. 31, 2016 $ 40,660 $ 0 $ 12 $ 86,764 $ (11,581) $ (34,535)
Increase (Decrease) in Stockholders' Equity            
Net loss (24,535)         (24,535)
Stock-based compensation expense (155)     (154) (1)  
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        
Ending balance at Mar. 31, 2017 30,048 24,617 14 100,686 (11,582) (59,070)
Beginning balance at Dec. 31, 2016 40,660 0 12 86,764 (11,581) (34,535)
Increase (Decrease) in Stockholders' Equity            
Net loss (32,282)          
Ending balance at Jun. 30, 2017 18,210 27,807 14 96,543 (11,530) (66,817)
Beginning balance at Dec. 31, 2016 40,660 0 12 86,764 (11,581) (34,535)
Increase (Decrease) in Stockholders' Equity            
Net loss (41,483)          
Ending balance at Sep. 30, 2017 6,129 31,410 14 91,737 (9,604) (76,018)
Beginning balance at Dec. 31, 2016 40,660 0 12 86,764 (11,581) (34,535)
Increase (Decrease) in Stockholders' Equity            
Net loss (47,612)         (47,612)
Settlement of equity-related acquisition consideration (712)     (712)    
Stock-based compensation expense 1,183     (860) 2,043  
Payment of withholding taxes for net settlement of stock-based awards (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        
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 24,617 14 100,686 (11,582) (59,070)
Increase (Decrease) in Stockholders' Equity            
Net loss (7,747)         (7,747)
Settlement of equity-related acquisition consideration (712)     (712)    
Stock-based compensation expense (162)     (214) 52  
Deemed dividend on Series B convertible preferred stock (3,190) 3,190   (3,190)    
Ending balance at Jun. 30, 2017 18,210 27,807 14 96,543 (11,530) (66,817)
Increase (Decrease) in Stockholders' Equity            
Net loss (9,201)         (9,201)
Stock-based compensation expense 731     (1,195) 1,926  
Deemed dividend on Series B convertible preferred stock (3,603) 3,603   (3,603)    
Ending balance at Sep. 30, 2017 6,129 31,410 14 91,737 (9,604) (76,018)
Increase (Decrease) in Stockholders' Equity            
Net loss (6,129)         (6,129)
Stock-based compensation expense 771     705 66  
Deemed dividend on Series B convertible preferred stock (31,067) 31,067   (31,067)    
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)
Increase (Decrease) in Stockholders' Equity            
Net loss (14,204)         (14,204)
Stock-based compensation expense 799     1,143 (344)  
Ending balance at Mar. 31, 2018 20,480   19 124,981 (9,882) (94,638)
Beginning balance at Dec. 31, 2017 32,172 0 19 123,838 (9,538) (82,147)
Increase (Decrease) in Stockholders' Equity            
Net loss (26,009)          
Ending balance at Jun. 30, 2018 8,925   19 125,272 (9,923) (106,443)
Beginning balance at Dec. 31, 2017 32,172 0 19 123,838 (9,538) (82,147)
Increase (Decrease) in Stockholders' Equity            
Net loss (44,828)          
Ending balance at Sep. 30, 2018 (9,269)   19 125,938 (9,964) (125,262)
Beginning balance at Dec. 31, 2017 32,172 0 19 123,838 (9,538) (82,147)
Increase (Decrease) in Stockholders' Equity            
Net loss (54,726)         (54,726)
Stock-based compensation expense 2,663     2,974 (311)  
Payment of withholding taxes for net settlement of stock-based awards (400)     (400)    
Ending balance at Dec. 31, 2018 (18,578) 0 19 126,412 (9,849) (135,160)
Beginning balance at Mar. 31, 2018 20,480   19 124,981 (9,882) (94,638)
Increase (Decrease) in Stockholders' Equity            
Net loss (11,805)         (11,805)
Stock-based compensation expense 619     660 (41)  
Ending balance at Jun. 30, 2018 8,925   19 125,272 (9,923) (106,443)
Increase (Decrease) in Stockholders' Equity            
Net loss (18,819)         (18,819)
Stock-based compensation expense 545     586 (41)  
Ending balance at Sep. 30, 2018 (9,269)   19 125,938 (9,964) (125,262)
Increase (Decrease) in Stockholders' Equity            
Net loss (9,898)         (9,898)
Stock-based compensation expense 700     585 115  
Ending balance at Dec. 31, 2018 $ (18,578) $ 0 $ 19 $ 126,412 $ (9,849) $ (135,160)