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Condensed Statements of Changes in Stockholders’ Equity (Deficit) - USD ($)
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Total
Balance at beginning of period at Dec. 31, 2017 $ 18,000 $ 64,397,000 $ (60,474,000) $ 3,941,000
Balance at beginning of period (shares) at Dec. 31, 2017 10,633,042      
Increase (Decrease) in Stockholders' Equity        
Issuance of common stock $ 4,000 25,146,000   $ 25,150,000
Issuance of common stock (in shares) 3,592,858     3,592,858
Issuance costs   (2,093,000)   $ (2,093,000)
Exercise of stock options   23,000   23,000
Exercise of stock options (in shares) 6,413      
Share-based compensation - employee   1,019,000   1,019,000
Share-based compensation - non-employee   1,000   1,000
Net loss     (7,224,000) (7,224,000)
Balance at end of period at Mar. 31, 2018 $ 22,000 88,493,000 (67,698,000) 20,817,000
Balance at end of period (shares) at Mar. 31, 2018 14,232,313      
Balance at beginning of period at Dec. 31, 2017 $ 18,000 64,397,000 (60,474,000) 3,941,000
Balance at beginning of period (shares) at Dec. 31, 2017 10,633,042      
Increase (Decrease) in Stockholders' Equity        
Exercise of warrants       0
Net loss       (19,981,000)
Balance at end of period at Sep. 30, 2018 $ 22,000 91,286,000 (80,455,000) 10,853,000
Balance at end of period (shares) at Sep. 30, 2018 14,265,411      
Balance at beginning of period at Mar. 31, 2018 $ 22,000 88,493,000 (67,698,000) 20,817,000
Balance at beginning of period (shares) at Mar. 31, 2018 14,232,313      
Increase (Decrease) in Stockholders' Equity        
Share-based compensation - employee   908,000   908,000
Share-based compensation - non-employee   1,000   1,000
Net loss     (6,678,000) (6,678,000)
Balance at end of period at Jun. 30, 2018 $ 22,000 89,402,000 (74,376,000) 15,048,000
Balance at end of period (shares) at Jun. 30, 2018 14,232,313      
Increase (Decrease) in Stockholders' Equity        
Warrant issuance   196,000   196,000
Exercise of stock options   61,000   61,000
Exercise of stock options (in shares) 33,098      
Exercise of warrants       0
Share-based compensation - employee   1,626,000   1,626,000
Share-based compensation - non-employee   1,000   1,000
Net loss     (6,079,000) (6,079,000)
Balance at end of period at Sep. 30, 2018 $ 22,000 91,286,000 (80,455,000) 10,853,000
Balance at end of period (shares) at Sep. 30, 2018 14,265,411      
Balance at beginning of period at Dec. 31, 2018 $ 22,000 91,863,000 (84,111,000) 7,774,000
Balance at beginning of period (shares) at Dec. 31, 2018 14,265,411      
Increase (Decrease) in Stockholders' Equity        
Share-based compensation - employee   473,000   473,000
Net loss     (3,801,000) (3,801,000)
Balance at end of period at Mar. 31, 2019 $ 22,000 92,336,000 (87,912,000) 4,446,000
Balance at end of period (shares) at Mar. 31, 2019 14,265,411      
Balance at beginning of period at Dec. 31, 2018 $ 22,000 91,863,000 (84,111,000) 7,774,000
Balance at beginning of period (shares) at Dec. 31, 2018 14,265,411      
Increase (Decrease) in Stockholders' Equity        
Exercise of warrants       0
Net loss       (10,151,000)
Balance at end of period at Sep. 30, 2019 $ 23,000 93,214,000 (94,262,000) (1,025,000)
Balance at end of period (shares) at Sep. 30, 2019 14,872,411      
Balance at beginning of period at Mar. 31, 2019 $ 22,000 92,336,000 (87,912,000) 4,446,000
Balance at beginning of period (shares) at Mar. 31, 2019 14,265,411      
Increase (Decrease) in Stockholders' Equity        
Share-based compensation - employee   438,000   438,000
Net loss     (2,920,000) (2,920,000)
Balance at end of period at Jun. 30, 2019 $ 22,000 92,774,000 (90,832,000) 1,964,000
Balance at end of period (shares) at Jun. 30, 2019 14,265,411      
Increase (Decrease) in Stockholders' Equity        
Exercise of warrants       0
Share-based compensation - employee   441,000   441,000
Restricted stock issuance $ 1,000 (1,000)    
Restricted stock issuance (in shares) 607,000      
Net loss     (3,430,000) (3,430,000)
Balance at end of period at Sep. 30, 2019 $ 23,000 $ 93,214,000 $ (94,262,000) $ (1,025,000)
Balance at end of period (shares) at Sep. 30, 2019 14,872,411