Stockholders Deficit - Additional Information (Details) - USD ($)				1 Months Ended			3 Months Ended				9 Months Ended
	Mar. 24, 2020	Feb. 25, 2020	Jan. 01, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Aug. 31, 2020	Dec. 31, 2019	Nov. 30, 2019	May 31, 2019	May 31, 2015
Class Of Stock [Line Items]
Common stock, shares outstanding							71,078,958				71,078,958			58,090,233
Common stock, shares issued							71,078,958				71,078,958			58,090,233
Employee Stock Option
Class Of Stock [Line Items]
Unrecognized compensation expense							$ 2,700,000				$ 2,700,000
Compensation expense period expected to be recognized											2 years 5 months 8 days
Restricted Stock Units R S U
Class Of Stock [Line Items]
Unrecognized compensation expense							$ 300,000				$ 300,000
Compensation expense period expected to be recognized											1 year 11 months 4 days
Vested and unissued RSU awards, description											Vested and unissued awards at September 30, 2020 represents RSU awards for which the vesting date was September 30, 2020, but for which issuance of the awards occurred in October 2020.
Vested and unissued RSU awards vesting date											Sep. 30, 2020
Vested and unissued RSU awards issuance date											Oct. 31, 2020
2014 Equity Incentive Plan
Class Of Stock [Line Items]
Shares reserved for issuance													1,028,292			200,000	940,112
Number of shares available for issuance													0			0	0
Number of additional shares registered for issuance			2,323,609
2020 Equity Incentive Plan
Class Of Stock [Line Items]
Shares reserved for issuance													11,170,288
Options granted in term											10 years
2020 Equity Incentive Plan | Board of Directors | Minimum
Class Of Stock [Line Items]
Options exercise period											1 year
2020 Equity Incentive Plan | Board of Directors | Maximum
Class Of Stock [Line Items]
Options exercise period											4 years
Common Stock
Class Of Stock [Line Items]
Number of shares issued upon the conversion								2,750,000
Cantor Sales Agreement
Class Of Stock [Line Items]
Common stock price per share															$ 0.001
Exchange Agreement
Class Of Stock [Line Items]
Common stock, shares outstanding		4,110,000
Conversion of convertible preferred stock into common stock		100
Exchange Agreement | Series A Convertible Preferred Stock
Class Of Stock [Line Items]
Issuance of common stock, shares		10,170
Preferred stock, shares issued		41,100
Preferred stock, par value		$ 0.001
Issuance of common stock		$ 600,030
Stock issued, price per share		$ 59.00
Preferred stock, shares converted				27,500
Preferred stock, shares outstanding							23,770				23,770
Exchange Agreement | Common Stock
Class Of Stock [Line Items]
Number of shares issued upon the conversion				2,750,000
LP Purchase Agreement | Common Stock
Class Of Stock [Line Items]
Issuance of common stock, shares									615,384
Issuance of common stock									$ 615
Pre-funded Warrants
Class Of Stock [Line Items]
Exercise price of warrants							$ 0.01				$ 0.01
Lincoln Park | LP Purchase Agreement
Class Of Stock [Line Items]
Common stock value right to sell, maximum	$ 20,000,000
Agreement term	36 months
Common stock, shares issued	615,384						0				0
Lincoln Park | LP Purchase Agreement | Additional Paid-In-Capital
Class Of Stock [Line Items]
Commitment consideration and related transaction costs										$ 0	$ 100,000	$ 0
Private Placement | Institutional Accredited Investors
Class Of Stock [Line Items]
Exercise price of warrants						$ 0.65	$ 0.65			$ 0.65	$ 0.65	$ 0.65
Private Placement | Institutional Accredited Investors | Pre-funded Warrants
Class Of Stock [Line Items]
Issuance of warrants, shares						5,411,687	5,411,687			5,411,687	5,411,687	5,411,687
Number of securities called by warrants						5,411,687	5,411,687			5,411,687	5,411,687	5,411,687
Exercise price of warrants						$ 0.64	$ 0.64			$ 0.64	$ 0.64	$ 0.64
Exercise price of warrants, exercisable subject to beneficial ownership limitations						$ 0.01	$ 0.01			$ 0.01	$ 0.01	$ 0.01
Private Placement | Cantor Fitzgerald & Co. | Pre-funded Warrants
Class Of Stock [Line Items]
Number of securities called by warrants					3,176,762				3,176,762
Agent cash fee, percentage of gross proceeds from sale of warrants						6.00%
Net proceeds from sale of warrants					$ 31,768	$ 3,100,000
ATM Offering
Class Of Stock [Line Items]
Gross proceeds from issuance of common stock											$ 6,700,000
Payment of sales commissions											200,000
Net proceeds from issuance of common stock from the ATM Offering											$ 6,400,000
Issuance of common stock							$ 2,557,012	$ 1,395,058	$ 2,435,912
ATM Offering | Common Stock
Class Of Stock [Line Items]
Issuance of common stock, shares							3,952,240	2,084,714	4,399,062		10,436,016
Deferred offering costs														$ 100,000
Issuance of common stock							$ 3,952	$ 2,085	$ 4,399