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Consolidated Statements of Shareholders' Equity Statement - USD ($)
$ in Thousands
Total
Common Stock
Accumulated Other Comprehensive Income
Accumulated Deficit
Beginning Balance (in shares) at Dec. 31, 2018   36,937,458    
Beginning Balance at Dec. 31, 2018 $ 49,390 $ 428,903 $ 15 $ (379,528)
Stock issued under employee equity incentive plans (in shares)   605,911    
Stock issued under employee equity incentive plans 315 $ 315    
Stock-based compensation expense 1,689 $ 1,689    
Unrealized gain (loss) on available for sale securities 4   4  
Net income (loss) 133     133
Ending Balance (in shares) at Mar. 31, 2019   37,543,369    
Ending Balance at Mar. 31, 2019 51,531 $ 430,907 19 (379,395)
Beginning Balance (in shares) at Dec. 31, 2018   36,937,458    
Beginning Balance at Dec. 31, 2018 49,390 $ 428,903 15 (379,528)
Net income (loss) (2,315)      
Ending Balance (in shares) at Jun. 30, 2019   37,833,791    
Ending Balance at Jun. 30, 2019 50,751 $ 432,572 22 (381,843)
Beginning Balance (in shares) at Mar. 31, 2019   37,543,369    
Beginning Balance at Mar. 31, 2019 51,531 $ 430,907 19 (379,395)
Stock issued under employee equity incentive plans (in shares)   290,422    
Stock issued under employee equity incentive plans 0 $ 0    
Stock-based compensation expense 1,665 $ 1,665    
Unrealized gain (loss) on available for sale securities 3   3  
Net income (loss) (2,448)     (2,448)
Ending Balance (in shares) at Jun. 30, 2019   37,833,791    
Ending Balance at Jun. 30, 2019 50,751 $ 432,572 22 (381,843)
Beginning Balance (in shares) at Dec. 31, 2019   38,434,488    
Beginning Balance at Dec. 31, 2019 47,529 $ 436,122 12 (388,605)
Stock issued under employee equity incentive plans (in shares)   815,375    
Stock issued under employee equity incentive plans 325 $ 325    
Stock-based compensation expense 1,822 $ 1,822    
Unrealized gain (loss) on available for sale securities (6)   (6)  
Net income (loss) (5,399)     (5,399)
Ending Balance (in shares) at Mar. 31, 2020   39,249,863    
Ending Balance at Mar. 31, 2020 44,271 $ 438,269 6 (394,004)
Beginning Balance (in shares) at Dec. 31, 2019   38,434,488    
Beginning Balance at Dec. 31, 2019 47,529 $ 436,122 12 (388,605)
Net income (loss) (11,951)      
Ending Balance (in shares) at Jun. 30, 2020   40,220,491    
Ending Balance at Jun. 30, 2020 42,455 $ 442,998 13 (400,556)
Beginning Balance (in shares) at Mar. 31, 2020   39,249,863    
Beginning Balance at Mar. 31, 2020 44,271 $ 438,269 6 (394,004)
At the market equity offering, value 2,474 $ 2,474    
At the market equity offering, shares   803,528    
Stock issued under employee equity incentive plans (in shares)   167,100    
Stock issued under employee equity incentive plans 12 $ 12    
Stock-based compensation expense 2,243 $ 2,243    
Unrealized gain (loss) on available for sale securities 7   7  
Net income (loss) (6,552)     (6,552)
Ending Balance (in shares) at Jun. 30, 2020   40,220,491    
Ending Balance at Jun. 30, 2020 $ 42,455 $ 442,998 $ 13 $ (400,556)