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Statements of Operations - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Statement [Abstract]        
Collaboration revenue $ 45   $ 90  
Type of Revenue [Extensible List] clsd:CollaborationMember clsd:CollaborationMember clsd:CollaborationMember clsd:CollaborationMember
Operating expenses:        
Research and development $ 658 $ 17,343 $ 11,625 $ 30,722
General and administrative 5,004 3,561 9,388 6,635
Total operating expenses 5,662 20,904 21,013 37,357
Loss from operations (5,617) (20,904) (20,923) (37,357)
Other (expense) income, net (117) 203 (215) 49
Net loss $ (5,734) $ (20,701) $ (21,138) $ (37,308)
Net loss per share of common stock — basic and diluted $ (0.15) $ (0.65) $ (0.59) $ (1.27)
Weighted average shares outstanding — basic and diluted 37,636,053 31,979,158 35,899,777 29,412,904