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Supplementary Data — Quarterly Financial Data (unaudited) (Details) - USD ($)
 2 Months Ended 3 Months Ended 10 Months Ended 12 Months Ended
Oct. 31, 2014
Dec. 31, 2014
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Oct. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating expenses:                            
General and administrative     $ 2,389,000 $ 1,466,000 $ 1,051,000 $ 1,050,000 $ 1,047,000 $ 997,000 $ 658,000 $ 475,000   $ 5,956,000 $ 3,177,000 $ 214,000
Research and development     4,839,000 1,936,000 789,000 1,176,000 1,464,000 1,369,000 952,000 206,000   8,740,000 3,991,000 52,000
Acquired in-process research and development                   908,000     908,000  
Total operating expenses     7,228,000 3,402,000 1,840,000 2,226,000 2,511,000 2,366,000 1,610,000 1,589,000   14,696,000 8,076,000 266,000
Loss from operations     (7,228,000) (3,402,000) (1,840,000) (2,226,000) (2,511,000) (2,366,000) (1,610,000) (1,589,000)   (14,696,000) (8,076,000) (266,000)
Interest income (expense)     13,000 (475,000) 449,000 127,000 137,000 (209,000)   (690,000)   114,000 (762,000) (55,000)
Loss on convertible note extinguishment             (198,000)           (198,000)  
Other (expense) income     1,000 (1,000)   (4,000) 2,000 6,000 (1,000)     (4,000) 7,000 1,000
Loss before income taxes     (7,214,000) (3,878,000) (1,391,000) (2,103,000) (2,570,000) (2,569,000) (1,611,000) (2,279,000)   (14,586,000) (9,029,000) (320,000)
Provision (benefit) for income taxes $ 0                     0    
Net loss   $ (196,000) (7,214,000) (3,878,000) (1,391,000) (2,103,000) (2,570,000) (2,569,000) (1,611,000) (2,279,000) $ (124,000) (14,586,000) (9,029,000) (320,000)
Comprehensive loss     (7,214,000) (3,878,000) (1,391,000) (2,103,000) (2,570,000) (2,569,000) (1,611,000) (2,279,000)   (14,586,000) (9,029,000) (320,000)
Net loss   $ (196,000) (7,214,000) (3,878,000) (1,391,000) (2,103,000) (2,570,000) (2,569,000) (1,611,000) (2,279,000) $ (124,000) (14,586,000) (9,029,000) (320,000)
Adjustment to redemption value on Series A convertible preferred stock       (67,000) (150,000) (149,000) (150,000) (152,000) (149,000) (2,517,000)   (366,000) (2,968,000)  
Premium upon substantial modification of convertible notes with certain stockholders             (1,047,000)           (1,047,000)  
Net loss attributable to common stockholders     $ (7,214,000) $ (3,945,000) $ (1,541,000) $ (2,252,000) $ (3,767,000) $ (2,721,000) $ (1,760,000) $ (4,796,000)   $ (14,952,000) $ (13,044,000) $ (320,000)
Net loss per share:                            
Basic and diluted (Note 10)     $ (0.78) $ (0.56) $ (0.42) $ (0.65) $ (1.14) $ (0.87) $ (0.60) $ (2.27)   $ (2.57) $ (4.54) $ (0.21)
Number of shares used in per share calculations:                            
Basic and diluted                       5,809,396 2,875,053 1,521,703