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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common stock
Additional paid-in capital
AOCI Attributable to Parent
Accumulated deficit
Balance (in shares) at Dec. 31, 2018   50,606,147      
Balance at the beginning of the period at Dec. 31, 2018 $ 350,727 $ 51 $ 1,288,137 $ 1,462 $ (938,923)
Increase (Decrease) in Stockholders' Equity          
Issuance of common stock related to equity offering (in shares)   7,563,725      
Issuance of common stock related to equity offering 224,545 $ 7 224,538    
Issuance of common stock related to rights exchange 0        
Exercised (in shares)   311,002      
Exercise of options 4,129 $ 0 4,129    
Restricted stock vesting and issuance, net (in shares)   171,592      
Restricted stock vesting and issuance, net 0        
Issuance of common stock in connection with an employee stock purchase plan (in shares)   54,719      
Issuance of common stock in connection with an employee stock purchase plan 1,564 $ 0 1,564    
Share-based compensation expense 20,184   20,184    
Receivable from investor 978   978    
Net loss (113,902)       (113,902)
Comprehensive income 460     460  
Balance (in shares) at Jun. 30, 2019   58,707,185      
Balance at the end of the period at Jun. 30, 2019 488,685 $ 58 1,539,530 1,922 (1,052,825)
Balance (in shares) at Mar. 31, 2019   58,418,790      
Balance at the beginning of the period at Mar. 31, 2019 512,942 $ 58 1,523,115 805 (1,011,036)
Increase (Decrease) in Stockholders' Equity          
Issuance of common stock related to equity offering (in shares)   0      
Issuance of common stock related to equity offering 106 $ 0 106    
Exercised (in shares)   230,176      
Exercise of options 2,847   2,847    
Restricted stock vesting and issuance, net (in shares)   3,500      
Restricted stock vesting and issuance, net 0        
Issuance of common stock in connection with an employee stock purchase plan (in shares)   54,719      
Issuance of common stock in connection with an employee stock purchase plan 1,564 $ 0 1,564    
Share-based compensation expense 10,920   10,920    
Receivable from investor 978   978    
Net loss (41,789)       (41,789)
Comprehensive income 1,117     1,117  
Balance (in shares) at Jun. 30, 2019   58,707,185      
Balance at the end of the period at Jun. 30, 2019 488,685 $ 58 1,539,530 1,922 (1,052,825)
Balance (in shares) at Dec. 31, 2019   61,935,870      
Balance at the beginning of the period at Dec. 31, 2019 594,330 $ 62 1,795,351 (10,584) (1,190,499)
Increase (Decrease) in Stockholders' Equity          
Issuance of common stock related to equity offering (in shares)   368,514      
Issuance of common stock related to equity offering 18,950 $ 0 18,950    
Payments for asset acquisitions, shares (in shares)   845,364      
Payments for asset acquisitions, share, value 42,869 $ 1 42,868    
Issuance of common stock related to rights exchange (in shares)   2,821,176      
Issuance of common stock related to rights exchange 150,528 $ 3 150,525    
Exercised (in shares)   1,034,288      
Exercise of options 25,045 $ 1 25,044    
Restricted stock vesting and issuance, net (in shares)   176,776      
Restricted stock vesting and issuance, net 0        
Issuance of common stock in connection with an employee stock purchase plan (in shares)   58,691      
Issuance of common stock in connection with an employee stock purchase plan 2,406 $ 0 2,406    
Share-based compensation expense 32,130   32,130    
Other (218)        
Net loss (294,114)       (294,114)
Comprehensive income 568     568  
Balance (in shares) at Jun. 30, 2020   67,240,679      
Balance at the end of the period at Jun. 30, 2020 572,494 $ 67 2,067,274 (10,016) (1,484,831)
Balance (in shares) at Mar. 31, 2020   62,758,520      
Balance at the beginning of the period at Mar. 31, 2020 528,734 $ 62 1,834,061 (1,985) (1,303,404)
Increase (Decrease) in Stockholders' Equity          
Issuance of common stock related to equity offering (in shares)   106,309      
Issuance of common stock related to equity offering 5,447 $ 0 5,447    
Payments for asset acquisitions, shares (in shares)   845,364      
Payments for asset acquisitions, share, value 42,869 $ 1 42,868    
Issuance of common stock related to rights exchange (in shares)   2,821,176      
Issuance of common stock related to rights exchange 150,528 $ 3 150,525    
Exercised (in shares)   654,604      
Exercise of options 15,058 $ 1 15,057    
Restricted stock vesting and issuance, net (in shares)   (3,985)      
Restricted stock vesting and issuance, net 0        
Issuance of common stock in connection with an employee stock purchase plan (in shares)   58,691      
Issuance of common stock in connection with an employee stock purchase plan 2,406 $ 0 2,406    
Share-based compensation expense 16,910   16,910    
Net loss (181,427)        
Comprehensive income (8,031)     (8,031)  
Balance (in shares) at Jun. 30, 2020   67,240,679      
Balance at the end of the period at Jun. 30, 2020 $ 572,494 $ 67 $ 2,067,274 $ (10,016) $ (1,484,831)