Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY

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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Convertible Preferred Stock
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Total
Balance at Dec. 31, 2017   $ 62 $ 1,184,783 $ (1,179,059) $ 5,786
Balance (in shares) at Dec. 31, 2017 5,000 8,249,000      
Increase (Decrease) in Stockholders' Equity          
Exercise of stock options   $ 1 366   367
Exercise of stock options (in shares)   68,000      
Issuance of common stock related to 401(k) contribution and ESPP     64   64
Issuance of common stock related to 401(k) contribution and ESPP (in shares)   4,000      
Vesting of restricted stock units (in shares)   16,000      
Stock-based compensation expense     3,902   3,902
Issuance of warrants     139   139
Issuance of convertible preferred stock, net     16,004   16,004
Issuance of convertible preferred stock, net (in shares) 1,000        
Issuance of common stock, net   $ 2 5,864   5,866
Issuance of common stock, net (in shares)   354,000      
Net loss and comprehensive loss       (13,343) (13,343)
Balance at Dec. 31, 2018   $ 65 1,211,122 (1,192,402) 18,785
Balance (in shares) at Dec. 31, 2018 6,000 8,691,000      
Increase (Decrease) in Stockholders' Equity          
Exercise of stock options     273   $ 273
Exercise of stock options (in shares)   56,000     55,759
Issuance of common stock related to 401(k) contribution and ESPP     136   $ 136
Issuance of common stock related to 401(k) contribution and ESPP (in shares)   10,000      
Vesting of restricted stock units (in shares)   2,000      
Stock-based compensation expense     4,948   4,948
Issuance of warrants     66   66
Issuance of common stock, net   $ 8 21,754   21,762
Issuance of common stock, net (in shares)   1,000,000      
Net loss and comprehensive loss       (1,982) (1,982)
Balance at Dec. 31, 2019   $ 73 $ 1,238,299 $ (1,194,384) $ 43,988
Balance (in shares) at Dec. 31, 2019 6,000 9,759,000