Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY

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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Preferred Stock
Preferred Stock
Preferred Additional Paid‑In Capital
Common Stock
Additional Paid‑In Capital
Accumulated Deficit
BALANCE at Dec. 31, 2015 $ 69,571     $ 0 $ 0 $ 35 $ 223,299 $ (153,763)
Balance (in shares) at Dec. 31, 2015       0   34,621,000    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Stock‑based compensation cost 1,649           1,649  
Stock issued, net of costs   $ 40,425 $ 162,511 $ 17 162,494 $ 18 40,407  
Stock issued, net of costs (in shares)       17,000,000   18,007,000    
Net income (loss) (53,147)             (53,147)
BALANCE at Dec. 31, 2016 221,009     $ 17 162,494 $ 53 265,355 (206,910)
Balance (in shares) at Dec. 31, 2016       17,000,000   52,628,000    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Stock‑based compensation cost 9,489           9,489  
Stock issued, net of costs 170,141         $ 13 170,128  
Stock issued, net of costs (in shares)           13,250,000    
Conversion of preferred stock to common stock at Initial Public Offering 0     $ (17) (162,494) $ 17 162,494  
Conversion of preferred stock to common stock at Initial Public Offering (in shares)       (17,000,000)   17,000,000    
Issuance of equity award—net 0              
Issuance of equity award—net (in shares)           162,000    
Net income (loss) 12,613             12,613
BALANCE at Dec. 31, 2017 413,252     $ 0 0 $ 83 607,466 (194,297)
Balance (in shares) at Dec. 31, 2017       0   83,040,000    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Stock‑based compensation cost 5,482           5,482  
Stock issued, net of costs 204,512         $ 16 204,496  
Stock issued, net of costs (in shares)           16,600,000    
Exercise of stock options—net $ 247         $ 1 246  
Exercise of stock options—net (in shares) 49,912         550,000    
Net income (loss) $ 173,862             173,862
BALANCE at Dec. 31, 2018 $ 797,355     $ 0 $ 0 $ 100 $ 817,690 $ (20,435)
Balance (in shares) at Dec. 31, 2018       0   100,190,000