Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions		6 Months Ended	12 Months Ended
	Jul. 31, 2020	Jun. 30, 2020	Dec. 31, 2019	Dec. 30, 2019	Jan. 09, 2020
Subsequent Event [Line Items]
Number of shares of stock (in shares)		0	524,097	75,000
Common stock to be called by warrants (in shares)					818,900
Subsequent Event | PIPE Investors
Subsequent Event [Line Items]
Number of shares of stock (in shares)	2,744,078
Common stock to be called by warrants (in shares)	2,744,078
Stock price per share (in dollars per share)	$ 3.335
Warrant exercise price (in dollars per share)	$ 3.30
Warrant term	5 years
Gross proceeds from warrant exercises	$ 9.2