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CONDENSED CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK, REDEEMABLE COMMON STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) (Unaudited) - USD ($)
$ in Thousands
Total
Redeemable Common Stock [Member]
Convertible Preferred Shares [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income [Member]
Accumulated Deficit [Member]
Beginning balance at Dec. 31, 2017 $ (44,545) $ 734     $ 1,385   $ (45,930)
Convertible preferred shares, beginning balance at Dec. 31, 2017     $ 60,903        
Beginning balance, shares at Dec. 31, 2017   107,364   350,607      
Convertible preferred shares, beginning balance, shares at Dec. 31, 2017     38,018,968        
Repurchase of Series Seed convertible preferred stock (22,000)           (22,000)
Repurchase of Series Seed convertible preferred stock, net of issuance costs of $1     $ (517)        
Repurchase of Series Seed convertible preferred stock, share $ 0 $ 0   $ 0 0 $ 0 $ 0
Repurchase of Series Seed convertible preferred stock, net of issuance costs of $1, share     (598,975)        
Convertible preferred shares, ending balance at Mar. 31, 2018     $ 60,386        
Convertible preferred shares, ending balance, shares at Mar. 31, 2018     37,419,993        
Stock-based compensation expense 128       128    
Net loss (7,367)            
Net loss (7,367)           (7,367)
Ending balance at Mar. 31, 2018 (51,806) $ 734     1,513   (53,319)
Ending balance, shares at Mar. 31, 2018   107,364   350,607      
Beginning balance at Dec. 31, 2018 (77,086) $ 734     2,151   (79,237)
Convertible preferred shares, beginning balance at Dec. 31, 2018 $ 64,675   $ 64,675        
Beginning balance, shares at Dec. 31, 2018   107,364   351,652      
Convertible preferred shares, beginning balance, shares at Dec. 31, 2018 40,079,567   40,079,567        
Conversion of redeemable common stock into common stock $ 734 $ (734)   $ 1 733    
Conversion of redeemable common stock into common stock, shares   (107,364)   107,364      
Conversion of convertible preferred shares into common stock 64,675   $ (64,675) $ 4 64,671    
Conversion of convertible preferred shares into common stock, shares     (40,079,567) 3,808,430      
Exchange of common stock in connection with Merger 45,541     $ 2 45,539    
Exchange of common stock in connection with Merger, shares       2,440,582      
Fair value of replacement equity awards 817       817    
Reclassification of warrant liability to permanent equity 5,235       5,235    
Exercise of stock options $ 113       113    
Exercise of stock options, shares 16,483     16,483      
Stock-based compensation expense $ 262       262    
Net loss (10,850)         23  
Net loss (10,873)           (10,873)
Ending balance at Mar. 31, 2019 $ 29,441     $ 7 $ 119,521 $ 23 $ (90,110)
Ending balance, shares at Mar. 31, 2019       6,724,511