Stockholders’ Equity (Details) - USD ($)					9 Months Ended		12 Months Ended
	Sep. 23, 2020	Feb. 21, 2020	Feb. 06, 2020	Mar. 22, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Feb. 19, 2020	Feb. 04, 2020
Class of Stock [Line Items]
Preferred stock, authorized (in shares)					2,000,000		2,000,000
Preferred shares, par value (in dollars per share)					$ 0.0001		$ 0.0001
Preferred shares, shares issued (in shares)					0		0
Preferred shares, shares outstanding (in shares)					0		0
Common shares, shares authorized (in shares)					170,000,000		170,000,000
Common shares, par value (in dollars per share)					$ 0.0001		$ 0.0001
Common shares, shares issued (in shares)					93,573,165		65,378,890
Common shares, shares outstanding (in shares)					93,573,165		65,378,890
Remaining amount available for sale					$ 32,300,000
Amount allocated to common stock					$ 9,000		$ 7,000
At-the-market offering
Class of Stock [Line Items]
Issuance of common stock (in shares)					1,128,608		1,840,443
Proceeds from the issuance of common shares					$ 2,325,478	$ 2,296,000	$ 5,383,079
Weighted average selling price (in dollars per share)					$ 2.06		$ 2.92
Common share issuance costs					$ 63,000	207,000	$ 309,479
Commissions and offering fees paid					63,000
Remaining amount available for sale					32,300,000
At-the-market offering | Maximum
Class of Stock [Line Items]
Sales agreement, threshold sale of shares				$ 40,000,000.0
Public offering
Class of Stock [Line Items]
Issuance of common stock (in shares)			3,191,489
Proceeds from the issuance of common shares		$ 8,000,000.0			43,148,000	18,777,000
Common share issuance costs		$ 100,000			2,469,000	$ 1,488,000
Common stock reserved for future issuance (up to) (in shares)									3,670,212
Share price (in dollars per share)			$ 2.22					$ 2.22
Over allotment
Class of Stock [Line Items]
Common stock reserved for future issuance (up to) (in shares)								478,723	478,723
Registered Direct Offering
Class of Stock [Line Items]
Common share issuance costs	$ 2,300,000
Common stock reserved for future issuance (up to) (in shares)	21,818,544
Gross proceeds from issuance of common stock and warrants	$ 35,000,000.0
Placement agent, cash fee, percentage of aggregate gross proceeds raised in Offering	6.00%
Amount payable to financial advisory firm for services related to offering	$ 420,000
Placement agent, cash fee, percentage of aggregate gross proceeds from cash exercise of warrants issued to investors	6.00%
Placement agent, cash fee, percentage of aggregate gross proceeds from cash exercise of any warrants issued in the offering from the exercise of warrants during the remainder term of such warrants	4.00%
Placement agent fee, non-accountable expenses	$ 50,000
Placement agent fee, clearing fees	12,900
Amount allocated to common stock					$ 26,100,000
Proceeds from issuance of warrants	$ 8,900,000
Registered Direct Offering | Warrants
Class of Stock [Line Items]
Share price (in dollars per share)	$ 1.51
Number of shares of common stock for which warrant is exercisable (in shares)	23,178,509
Number of shares of common stock each warrant is exercisable for (in shares)	1
Exercise price of warrant (in dollars per share)	$ 1.80
Maximum percentage of outstanding common stock able to be owned immediately after exercise of warrants	9.99%
Maximum percentage of outstanding common stock able to be owned immediately after exercise of warrants, at holder's option upon issuance	4.99%
Registered Direct Offering | Pre-Funded Warrants
Class of Stock [Line Items]
Number of shares of common stock for which warrant is exercisable (in shares)	1,360,265,000,000
Exercise price of warrant (in dollars per share)	$ 0.001