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Stockholders' Equity - Additional Information (Details)				1 Months Ended				3 Months Ended			9 Months Ended
Stockholders' Equity - Additional Information (Details)	Jul. 14, 2020 USD ($)	May 28, 2020 Director shares	Apr. 22, 2020 USD ($) $ / shares shares	Nov. 10, 2020 shares	Aug. 31, 2020 USD ($) $ / shares shares	Mar. 31, 2020 USD ($) shares	Nov. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) $ / shares shares	Mar. 31, 2020 shares	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2019 USD ($)	Dec. 31, 2019 $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares authorized \| shares								200,000,000			200,000,000		200,000,000
Common stock, par value \| $ / shares								$ 0.0001			$ 0.0001		$ 0.0001
Preferred stock, shares authorized \| shares								10,000,000			10,000,000
Preferred stock, par value \| $ / shares								$ 0.0001			$ 0.0001
Common stock, shares outstanding \| shares								24,724,544			24,724,544		17,425,654
Proceeds from issuance of common stock											$ 35,758,000
Repricing of outstanding options \| shares			1,475,093
Stock-based compensation expense								$ 847,000		$ 633,000	2,984,000	$ 1,660,000
Unamortized stock compensation for stock options								8,000,000			$ 8,000,000
Weighted-average recognition period of stock option unamortized											2 years 7 months 6 days
Number of non-management directors \| Director		2
Executive Chairman, Chief Executive Officer and Non-management Directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Retention stock options issued to purchase common shares \| shares		169,368
Executive Chairman
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Reduction in cash remuneration expressed as a percentage		65.00%
Chief Executive Officer
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Reduction in cash remuneration expressed as a percentage		85.00%
Non-Management Directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Reduction in cash remuneration expressed as a percentage		100.00%
Repricing of Outstanding Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unamortized stock-based compensation incremental expense on the repriced options			$ 400,000
Stock-based compensation expense								$ 26,000			$ 100,000
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise price of options per share \| $ / shares			$ 2.45
Open Market Sales Agreement \| 2019 ATM Facility
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Commission rate							3.00%
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Repricing of outstanding options \| shares			1,475,093					2,474,461			2,474,461		1,821,093
Exercise price of options per share \| $ / shares			$ 2.45
Stock-based compensation expense								$ 0			$ 400,000
Retention stock options issued to purchase common shares \| shares											653,368
Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Issuance of common stock, Shares \| shares								5,461,169	83,662
Common Stock \| Purchase Agreement \| Lincoln Park Capital Fund, LLC
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Issuance of common stock, Shares \| shares						65,374		0			0
Stock issuance costs						$ 400,000
Estimated maximum amount of common stock issuable						$ 15,000,000
Term of purchase agreement						36 months
Fair market value of commitment shares						$ 200,000
Common Stock \| Subsequent Event \| Purchase Agreement \| Lincoln Park Capital Fund, LLC
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Issuance of common stock, Shares \| shares				0
Common Stock \| Underwritten Public Offering
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Issuance of common stock, Shares \| shares					5,461,169
Sale of stock, price per share \| $ / shares					$ 7.00
Gross proceeds from issuance of common stock					$ 38,200,000
Proceeds from issuance of common stock					$ 35,700,000
Common Stock \| Over Allotment Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Issuance of common stock, Shares \| shares					461,169
Common Stock \| Open Market Sales Agreement \| 2019 ATM Facility
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Issuance of common stock, Shares \| shares								750,840			925,489
Gross proceeds from issuance of common stock								$ 7,500,000			$ 8,400,000
Proceeds from issuance of common stock								7,300,000			8,100,000
Common stock shares maximum aggregate offering price							$ 8,450,000
Stock issuance costs								$ 200,000			$ 300,000
Common Stock \| Open Market Sales Agreement \| 2020 ATM Facility
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Issuance of common stock, Shares \| shares								788,685			788,685
Gross proceeds from issuance of common stock								$ 10,400,000			$ 10,400,000
Proceeds from issuance of common stock								10,000,000			10,000,000
Common stock shares maximum aggregate offering price	$ 150,000,000
Stock issuance costs								$ 400,000			$ 400,000
Common Stock \| Open Market Sales Agreement \| 2020 ATM Facility \| Subsequent Event
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Issuance of common stock, Shares \| shares				0