Stockholders' Equity - Shares Issued (Details) - USD ($)	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Class of Stock [Line Items]
Proceeds from issuance of common stock, net of transaction costs	$ 0	$ 29,380,000
Common Stock
Class of Stock [Line Items]
Public offering (in shares)	113,349
Common Stock \| Company Employees
Class of Stock [Line Items]
Public offering (in shares)	1,676,680
Common Stock \| Board Members
Class of Stock [Line Items]
Public offering (in shares)	233,779
Common Stock \| Prior Company Executives
Class of Stock [Line Items]
Public offering (in shares)	227,876
Common Stock \| Consultant
Class of Stock [Line Items]
Public offering (in shares)	23,078
Common Stock \| Officers And Directors Plan
Class of Stock [Line Items]
Public offering (in shares)	1,554
Proceeds from issuance of common stock, net of transaction costs	$ 1,500