Share-Based Compensation - Stock Options (Details) - shares	9 Months Ended
	Sep. 30, 2019	Jan. 01, 2019	Sep. 30, 2016	Apr. 30, 2015
Stock Options, Additional Disclosures
Percentage of company's fully diluted shares	20.00%
A&R 2015 Plan
Stock Options, Additional Disclosures
Common stock reserved for issuance (in shares)	581,100	501,001
Number of years common shares automatically increase	10 years
Inducement Plan
Stock Options, Additional Disclosures
Common stock reserved for issuance (in shares)	268,667		300,000
Employees, Directors And Consultants | 2015 Plan
Stock Options, Additional Disclosures
Common stock reserved for issuance (in shares)				320,615