Annual report pursuant to Section 13 and 15(d)

STATEMENTS OF STOCKHOLDER'S EQUITY

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STATEMENTS OF STOCKHOLDER'S EQUITY - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Shares in Treasury [Member]
Accumulated Deficit [Member]
Beginning balance at Dec. 31, 2015 $ 24,257 $ 2 $ 40,737   $ (16,482)
Beginning balance, shares at Dec. 31, 2015   19,600,000      
Stock-based compensation expense 948   948    
Net loss (12,086)       (12,086)
Ending balance at Dec. 31, 2016 13,119 $ 2 41,685   (28,568)
Ending balance, shares at Dec. 31, 2016   19,600,000      
Issuance of common stock 57,980 $ 1 57,979    
Issuance of common stock, shares   8,050,000      
Stock options exercised $ 265   265    
Stock options exercised, shares 68,780 68,780      
Stock-based compensation expense $ 12,092   12,092    
Net loss (25,980)       (25,980)
Ending balance at Dec. 31, 2017 57,476 $ 3 112,021   (54,548)
Ending balance, shares at Dec. 31, 2017   27,718,780      
Issuance of common stock 57,041   57,041    
Issuance of common stock, shares   4,057,500      
Shares purchased (230)     $ (230)  
Shares purchased, shares   (15,536)      
Stock options exercised $ 2,622   2,622    
Stock options exercised, shares 592,342 888,149      
Stock-based compensation expense $ 4,385   4,385    
Net loss (27,897)       (27,897)
Ending balance at Dec. 31, 2018 $ 93,397 $ 3 $ 176,069 $ (230) $ (82,445)
Ending balance, shares at Dec. 31, 2018   32,648,893