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Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Income Statement [Abstract]                    
Revenue                 $ 0 $ 0
Operating expenses:                    
Research and development $ 4,709 $ 4,475 $ 4,305 $ 4,174 $ 3,961 $ 4,321 $ 5,320 $ 4,846 17,663 18,448
General and administrative 2,639 3,440 3,075 3,139 3,021 3,177 4,339 2,917 12,293 13,454
Total operating expenses 7,348 7,915 7,380 7,313 6,982 7,498 9,659 7,763 29,956 31,902
Loss from operations (7,348) (7,915) (7,380) (7,313) (6,982) (7,498) (9,659) (7,763) (29,956) (31,902)
Interest income, net 112 166 208 101 (52) 64 168 175 587 355
Net loss $ (7,236) $ (7,749) $ (7,172) $ (7,212) $ (7,034) $ (7,434) $ (9,491) $ (7,588) $ (29,369) $ (31,547)
Net loss per share—basic and diluted $ (0.26) $ (0.28) $ (0.26) $ (0.49) $ (0.48) $ (0.50) $ (0.64) $ (0.52) $ (1.20) $ (2.14)
Weighted average common shares outstanding—basic and diluted 27,810,358 27,810,358 27,526,065 14,816,253 14,745,707 14,737,402 14,737,236 14,732,287 24,535,454 14,738,193
Comprehensive loss:                    
Net loss $ (7,236) $ (7,749) $ (7,172) $ (7,212) $ (7,034) $ (7,434) $ (9,491) $ (7,588) $ (29,369) $ (31,547)
Other comprehensive gain (loss):                    
Unrealized gain (loss) on investments, net of tax of $0 (10) (7) 24 5 (2) 9 38 (17) 12 28
Total other comprehensive gain (loss) (10) (7) 24 5 (2) 9 38 (17) 12 28
Total comprehensive loss $ (7,246) $ (7,756) $ (7,148) $ (7,207) $ (7,036) $ (7,425) $ (9,453) $ (7,605) $ (29,357) $ (31,519)