Statement of Stockholders' Equity (Deficit) - USD ($)
shares in Thousands, $ in Thousands
Common Stock
Additional Paid-In Capital
Subscription Receivable
Accumulated Deficit
Total
Beginning balance, shares at Dec. 31, 2014 1,233        
Beginning balance, value at Dec. 31, 2014 $ 1 $ 66,759 $ (188) $ (73,874) $ (7,302)
Issuance of common stock for the settlement of options and warrants, shares issued 384        
Issuance of common stock for the settlement of options and warrants, value $ 1 2,089     2,090
Stock-based compensation   431     431
Issuance of common stock warrants   1,173     1,173
Net loss       (9,513) (9,513)
Ending balance, shares at Dec. 31, 2015 1,617        
Ending balance, value at Dec. 31, 2015 $ 2 70,452 (188) (83,387) (13,121)
Sale of stock, shares 3,680        
Sale of stock, value $ 4 27,596     27,600
Conversion of secured notes, shares 6,265        
Conversion of secured notes, value $ 6 23,486     23,492
Compensation in exchange for forgiveness of subscription receivable     188   188
Stock-based compensation, shares 462        
Stock-based compensation   2,468     2,468
Stock option exercises, shares 1        
Stock option exercises, value   4     4
Issuance of common stock warrants   1,249     1,249
Debt offering costs   (3,422)     (3,422)
Net loss       (12,610) (12,610)
Ending balance, shares at Dec. 31, 2016 12,025        
Ending balance, value at Dec. 31, 2016 $ 12 $ 121,833 $ 0 $ (95,997) $ 25,848