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Statements of Stockholders' Equity (Deficit) - USD ($)
$ in Thousands
Total
Preferred Stock
Series A Preferred Stock
Common Stock
Additional Paid In Capital
Accumulated Deficit
IPO
IPO
Common Stock
IPO
Additional Paid In Capital
Follow-on Offering
Follow-on Offering
Common Stock
Follow-on Offering
Additional Paid In Capital
Beginning balance (in shares) at Dec. 31, 2016   1,250,000 16,527,000                
Beginning balance at Dec. 31, 2016 $ (7,106) $ 0 $ 0 $ 59,700 $ (66,806)            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Stock-based compensation expense 586     586              
Capital contribution from Parent - therapeutic option right, net of tax 1,505     1,505              
Deemed distribution to Parent - note obligation (66,048)     (61,791) (4,257)            
Net loss (4,480)       (4,480)            
Ending balance (in shares) at Dec. 31, 2017   1,250,000 16,527,000                
Ending balance at Dec. 31, 2017 (75,543) $ 0 $ 0 0 (75,543)            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Stock-based compensation expense 6,971                    
Deemed contribution from Parent, increase of related-party receivable 1,051     1,051              
Deemed distribution to Parent - note obligation (2,000)     (1,385) (615)            
Capital contribution from Parent, convertible note write-off 66,998     66,998              
Capital contribution from Parent, forgiveness of related party borrowings 13,188     13,188              
Preferred stock conversion upon initial public offering (in shares)   (1,250,000) 2,065,875                
Stock issued during period, shares, new issues (in shares)             5,047,514     3,600,000  
Stock issued during period, value, new issues           $ 53,446 $ 1 $ 53,445 $ 67,379   $ 67,379
Issuance of common stock in connection with the incentive equity plan (in shares)     34,602                
Issuance of common stock in connection with the incentive equity plan (239)     (239)              
Net loss (46,867)       (46,867)            
Ending balance (in shares) at Dec. 31, 2018   0 27,274,991                
Ending balance at Dec. 31, 2018 $ 84,384 $ 0 $ 1 $ 207,408 $ (123,025)