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Consolidated Statements of Stockholders' Equity (Deficit) - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
AOCI Attributable to Parent [Member]
Total
Balance (in shares) at Dec. 31, 2017 22,987,434      
Balance at Dec. 31, 2017 $ 230 $ 364,806 $ (443,735) $ (78,699)
Issuance of shares pursuant to ATM offerings (in shares) 1,256,824      
Issuance of shares pursuant to ATM offerings $ 13 15,490 15,503
Issuance of shares pursuant to bond conversions (in shares) 376,463      
Issuance of shares pursuant to bond conversions $ 4 2,752 2,756
Stock compensation expense (in shares) 34,190      
Stock compensation expense 473 473
Net Loss (26,273) (26,273)
Balance (in shares) at Dec. 31, 2018 24,654,911      
Balance at Dec. 31, 2018 $ 247 383,521 (470,008) (86,240)
Issuance of shares pursuant to ATM offerings (in shares) 1,863,072      
Issuance of shares pursuant to ATM offerings $ 19 19,376 $ 19,395
Issuance of shares pursuant to bond conversions (in shares) 1,918,444     1,918,444
Issuance of shares pursuant to bond conversions $ 19 12,809 $ 12,828
Stock compensation expense (in shares) 44,140      
Stock compensation expense 562 562
Net Loss (29,528) (29,528)
Reclassification of warrant liability to Additional paid-in capital(1) [1] 2,896 (2,031) 865
Impact of warrant down-round feature 30 (30)
Balance (in shares) at Dec. 31, 2019 28,480,567      
Balance at Dec. 31, 2019 $ 285 $ 419,194 $ (501,597) $ (82,118)
[1] A cumulative effect adjustment of $2,031 thousand was recognized as of January 1, 2019, upon adoption of ASU 2017-11.