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Consolidated Statements of Contingently Redeemable Preferred Equity and Stockholders' Equity - USD ($)
$ in Thousands
Total
Common units
Common Shares $0.0001 Par
Common Shares $0.001 Par
Additional Paid-in Capital
Unrealized Gain/(Loss) on Securities
Accumulated Deficit
Contingently redeemable Series A preferred stock
Series A Convertible Preferred Stock
Series B Convertible Preferred Stock
Series C Convertible Preferred Stock
Contingently redeemable Class A preferred units
Class A preferred units
Class B preferred units
Balance at Dec. 31, 2016                       $ 5,000    
Balance (in units) at Dec. 31, 2016                       781,693    
Balance (in units) at Dec. 31, 2016                         3,922,027 1,029,850
Balance at Dec. 31, 2016                         $ 25,548 $ 13,611
Balance at Dec. 31, 2016 $ 8,503           $ (31,248)              
Sale of preferred units, net of issuance costs 26,648                         $ 26,648
Sale of preferred units, net of issuance costs (in units)                           1,971,717
Issuance of common stock for license agreement 1,750 $ 1,750                        
Exchange of preferred and common units into preferred and common stock               $ 5,000       $ 5,000    
Exchange of preferred and common units into preferred and common stock, Units               781,693       781,693    
Exchange of preferred and common units into preferred and common stock, (in units)                         (3,922,027) (3,001,567)
Exchange of preferred and common units into preferred and common stock                         $ (25,548) $ (40,259)
Exchange of preferred and common units into preferred and common stock                 $ 25,548 $ 40,259        
Exchange of preferred and common units into preferred and common stock, shares     2,020,367           3,922,027 3,001,567        
Exchange of preferred and common units into preferred and common stock         $ 2,342                  
Sale of preferred stock, net of issuance costs 40,433                   $ 40,433      
Sale of preferred stock, net of issuance costs (in units)                     2,882,679      
Convertible preferred stock and contingently redeemable preferred stock exchanged for common stock               $ (5,000)            
Convertible preferred stock and contingently redeemable preferred stock exchanged for common stock, Units               (781,693)            
Convertible preferred stock and contingently redeemable preferred stock exchanged for common stock                 $ (25,548) $ (40,259) $ (40,433)      
Convertible preferred stock and contingently redeemable preferred stock exchanged for common stock                 (3,922,027) (3,001,567) (2,882,679)      
Convertible preferred stock and contingently redeemable preferred stock exchanged for common stock 5,000     $ 10 111,230                  
Convertible preferred stock and contingently redeemable preferred stock exchanged for common stock, shares       10,587,966                    
Common stock ($.0001 par) exchanged for common stock ($.001 par)       $ 3 (3)                  
Common stock ($.0001 par) exchanged for common stock ($.001 par), shares     (2,714,694) 2,714,694                    
Issuance of common stock in the Merger 40,433     $ 3 40,430                  
Issuance of common stock in the Merger, shares       2,979,836                    
Exercise of stock options 5       5                  
Exercise of stock options, shares       386                    
Issuance of restricted stock, shares     697,292 2,884                    
Cancellation of restricted stock     (2,965) (13,149)                    
Equity-based compensation expense 2,652       2,652                  
Effect of adoption of ASU | ASU 2016-09         29   (29)              
Unrealized gain/(loss) on securities (9)         $ (9)                
Net loss (40,377)           (40,377)              
Balance at Dec. 31, 2017 $ 85,038     $ 16 156,685 (9) (71,654)              
Balance (in units) at Dec. 31, 2016   1,847,615                        
Balance at Dec. 31, 2016   $ 592                        
Issuance of common stock for license agreement (in units)   179,996                        
Repurchase of founders' units   (7,244)                        
Exchange of common units into preferred and common stock, (in units)   (2,020,367)                        
Exchange of common units into preferred and common stock, value   $ (2,342)                        
Balance (in Shares) at Dec. 31, 2017 16,272,617     16,272,617                    
Sale of common stock $ 82,666     $ 9 82,657                  
Sale of common stock, shares       9,179,500                    
Exercise of stock options 244       244                  
Exercise of stock options, shares       19,830                    
Cancellation of restricted stock       (70,468)                    
Equity-based compensation expense 4,317       4,317                  
Effect of adoption of ASU | ASU 2014-09 (ASC 606) 324           324              
Unrealized gain/(loss) on securities (56)         (56)                
Net loss (48,435)           (48,435)              
Balance at Dec. 31, 2018 $ 124,098     $ 25 $ 243,903 $ (65) $ (119,765)              
Balance (in Shares) at Dec. 31, 2018 25,401,479     25,401,479