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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Accumulated Other Comprehensive Income (Loss)
Balance (in shares) at Dec. 31, 2014   37,069      
Balance at Dec. 31, 2014 $ 292,159 $ 371 $ 427,287 $ (135,053) $ (446)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock, net of offering costs of $1.0 million (in shares)   3,500      
Issuance of common stock, net of offering costs of $1.0 million 76,056 $ 35 76,021    
Exercise of common stock warrants (in shares)   404      
Exercise of common stock warrants 7,730 $ 4 7,726    
Share-based compensation (in shares)   98      
Stock-based compensation 5,165 $ 1 5,164    
Purchase of common stock for retirement (in shares)   (61)      
Purchase of common stock for retirement (1,034) $ (1) (1,033)    
Other comprehensive income (loss) 446       446
Net income (loss) (39,911)     (39,911)  
Balance (in shares) at Dec. 31, 2015   41,010      
Balance at Dec. 31, 2015 340,611 $ 410 515,165 (174,964) 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock, net of offering costs of $1.0 million (in shares)   4,075      
Issuance of common stock, net of offering costs of $1.0 million 49,044 $ 41 49,003    
Share-based compensation (in shares)   218      
Stock-based compensation 6,625 $ 3 6,622    
Equity component of 5.00% Convertible Senior Notes due 2021, net of tax of $8.6 million 13,526   13,526    
Conversion of Bridge Notes (in shares)   273      
Conversion of Bridge Notes 3,340 $ 2 3,338    
Purchase of common stock for retirement (in shares)   (42)      
Purchase of common stock for retirement (598) $ (1) (597)    
Other comprehensive income (loss) 2,196       2,196
Net income (loss) (45,835)     (45,835)  
Balance (in shares) at Dec. 31, 2016   45,534      
Balance at Dec. 31, 2016 368,909 $ 455 587,057 (220,799) 2,196
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Share-based compensation (in shares)   303      
Stock-based compensation 7,204 $ 4 7,200    
Purchase of common stock for retirement (in shares)   (61)      
Purchase of common stock for retirement (963) $ (1) (962)    
Other comprehensive income (loss) (52)       (52)
Net income (loss) 72,621     72,621  
Balance (in shares) at Dec. 31, 2017   45,776      
Balance at Dec. 31, 2017 $ 447,719 $ 458 $ 593,295 $ (148,178) $ 2,144