Quarterly report pursuant to Section 13 or 15(d)

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (unaudited)

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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Convertible Preferred Stock [Member]
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Deficit [Member]
Balance at Dec. 31, 2017 $ 5,786   $ 62 $ 1,184,783 $ (1,179,059)
Balance (in shares) at Dec. 31, 2017   5 8,249    
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of stock options 14     14  
Issuance of common stock related to 401(k) contribution 20     20  
Issuance of common stock related to 401(k) contribution (in shares)     1    
Vesting of restricted stock units (in shares)     14    
Stock-based compensation expense 1,416     1,416  
Issuance of common stock 2,207     2,207  
Issuance of common stock (in shares)     68    
Net income (loss) and comprehensive income (loss) (3,806)       (3,806)
Balance at Mar. 31, 2018 5,637   $ 62 1,188,440 (1,182,865)
Balance (in shares) at Mar. 31, 2018   5 8,332    
Balance at Dec. 31, 2017 5,786   $ 62 1,184,783 (1,179,059)
Balance (in shares) at Dec. 31, 2017   5 8,249    
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) and comprehensive income (loss) (10,331)        
Balance at Sep. 30, 2018 1,153   $ 63 1,190,480 (1,189,390)
Balance (in shares) at Sep. 30, 2018   5 8,387    
Balance at Mar. 31, 2018 5,637   $ 62 1,188,440 (1,182,865)
Balance (in shares) at Mar. 31, 2018   5 8,332    
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of stock options 231   $ 1 230  
Exercise of stock options (in shares)     44    
Issuance of common stock related to ESPP 22     22  
Issuance of common stock related to ESPP (in shares)     1    
Vesting of restricted stock units (in shares)     2    
Stock-based compensation expense 770     770  
Issuance of warrants 139     139  
Net income (loss) and comprehensive income (loss) (1,947)       (1,947)
Balance at Jun. 30, 2018 4,852   $ 63 1,189,601 (1,184,812)
Balance (in shares) at Jun. 30, 2018   5 8,379    
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of stock options 32     32  
Exercise of stock options (in shares)     8    
Stock-based compensation expense 847     847  
Net income (loss) and comprehensive income (loss) (4,578)       (4,578)
Balance at Sep. 30, 2018 1,153   $ 63 1,190,480 (1,189,390)
Balance (in shares) at Sep. 30, 2018   5 8,387    
Balance at Dec. 31, 2018 18,785 [1]   $ 65 1,211,122 (1,192,402)
Balance (in shares) at Dec. 31, 2018   6 8,691    
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of stock options 115     115  
Exercise of stock options (in shares)     24    
Issuance of common stock related to 401(k) contribution 102     102  
Issuance of common stock related to 401(k) contribution (in shares)     7    
Vesting of restricted stock units (in shares)     2    
Stock-based compensation expense 1,728     1,728  
Issuance of warrants 66     66  
Net income (loss) and comprehensive income (loss) 3,233       3,233
Balance at Mar. 31, 2019 24,029   $ 65 1,213,133 (1,189,169)
Balance (in shares) at Mar. 31, 2019   6 8,724    
Balance at Dec. 31, 2018 18,785 [1]   $ 65 1,211,122 (1,192,402)
Balance (in shares) at Dec. 31, 2018   6 8,691    
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) and comprehensive income (loss) 2,339        
Balance at Sep. 30, 2019 25,786   $ 65 1,215,784 (1,190,063)
Balance (in shares) at Sep. 30, 2019   6 8,752    
Balance at Mar. 31, 2019 24,029   $ 65 1,213,133 (1,189,169)
Balance (in shares) at Mar. 31, 2019   6 8,724    
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of stock options 8     8  
Exercise of stock options (in shares)     2    
Issuance of common stock related to ESPP 16     16  
Issuance of common stock related to ESPP (in shares)     2    
Stock-based compensation expense 1,011     1,011  
Net income (loss) and comprehensive income (loss) (4,072)       (4,072)
Balance at Jun. 30, 2019 20,992   $ 65 1,214,168 (1,193,241)
Balance (in shares) at Jun. 30, 2019   6 8,728    
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of stock options 122     122  
Exercise of stock options (in shares)     24    
Stock-based compensation expense 1,494     1,494  
Net income (loss) and comprehensive income (loss) 3,178       3,178
Balance at Sep. 30, 2019 $ 25,786   $ 65 $ 1,215,784 $ (1,190,063)
Balance (in shares) at Sep. 30, 2019   6 8,752    
[1] The consolidated balance sheet as of December 31, 2018 has been derived from the audited consolidated financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018.