Quarterly report pursuant to Section 13 or 15(d)

Organization and Description of the Business (Details)

v3.20.2
Organization and Description of the Business (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Organization and Description of the Business              
Number of operating segments         1    
Accumulated deficit $ 425,092,000       $ 425,092,000   $ 413,145,000
Net loss $ 6,222,000 $ 5,725,000 $ 4,691,000 $ 5,169,000 $ 11,947,000 $ 9,860,000