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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Other Comprehensive Income/(Loss) [Member]
Accumulated Deficit [Member]
Balance at Dec. 31, 2017 $ 192,951 $ 1,370 $ 216,006 $ 291 $ (24,716)
Balance, shares at Dec. 31, 2017   136,996,000      
Common stock issued (Note 3) 137,250 $ 153 137,097    
Common stock issued, shares   15,250,000      
Restricted stock issued and vesting of restricted stock units, net   $ 9 (9)    
Restricted stock issued and vesting of restricted stock units net, shares   759,000      
Shares repurchased (2,885)   (2,885)    
Shares repurchased, shares   (334,000)      
Exercise of stock options, net 191   191    
Exercise of stock options net, shares   531,000      
Stock-based compensation 13,255   13,255    
Other comprehensive income 176     176  
Dividends (19,236)       (19,236)
Net income (loss) 36,633       36,633
Balance at Dec. 31, 2018 358,335 $ 1,532 363,655 467 (7,319)
Balance, shares at Dec. 31, 2018   153,202,000      
Restricted stock issued and vesting of restricted stock units, net   $ 22 (22)    
Restricted stock issued and vesting of restricted stock units net, shares   2,347,000      
Shares repurchased (2,341) $ (1) (2,340)    
Shares repurchased, shares   (370,000)      
Exercise of stock options, net 160   160    
Exercise of stock options net, shares   85,000      
Stock-based compensation 11,590   11,590    
Other comprehensive income 478     478  
Dividends (20,385)   (20,385)    
Net income (loss) (10,425)       (10,425)
Balance at Dec. 31, 2019 $ 337,412 $ 1,553 352,658 945 (17,744)
Balance, shares at Dec. 31, 2019 155,264,000 155,264,000      
Restricted stock issued and vesting of restricted stock units, net   $ 15 (15)    
Restricted stock issued and vesting of restricted stock units net, shares   1,569,000      
Shares repurchased $ (31,197) $ (82) (31,115)    
Shares repurchased, shares   (8,234,000)      
Exercise of stock options, net 292 $ 1 291    
Exercise of stock options net, shares   117,000      
Stock-based compensation 11,706   11,706    
Allocation of equity component related to convertible notes, net of issuance costs and deferred taxes 3,663   3,663    
Other comprehensive income 157     157  
Dividends (20,113)   (20,113)    
Net income (loss) (35,655)       (35,655)
Balance at Dec. 31, 2020 $ 266,265 $ 1,487 $ 317,075 $ 1,102 $ (53,399)
Balance, shares at Dec. 31, 2020 148,716,000 148,716,000