Organization and Description of the Business (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Organization and Description of the Business
Number of operating segments	1
Accumulated deficit	$ 418,870,000		$ 413,145,000
Net loss	$ 5,725,000	$ 5,169,000