Stock-Based Compensation - Additional Information (Details) - USD ($)	1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2020	Jan. 31, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total shares of common stock reserved			3,591,073		3,591,073		3,302,980
Weighted-average grant date fair value of stock options granted to employees and directors					$ 3.52	$ 3.31
Options granted					266,674
Aggregate grant date fair value of stock options vested					$ 705,805	$ 78,156
Total unrecognized compensation cost related to stock options granted to employees			$ 826,240		$ 826,240		$ 627,129
Common stock, par value			$ 0.0001	$ 0.0001	$ 0.0001	$ 0.0001	$ 0.0001
Stock based compensation expense			$ 366,000	$ 113,000	$ 570,000	$ 173,000
General and Administrative Expenses
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation expense			328,000	$ 82,000	511,000	$ 127,000
Keystone Capital Partners, LLC
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, par value	$ 4.00
Keystone Capital Partners, LLC | General and Administrative Expenses
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation expense					$ 80,000
Keystone Capital Partners, LLC | Stock Purchase Agreement
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock issued under purchase agreement			$ 1,100,000
Common Stock | Keystone Capital Partners, LLC
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares issued for administrative fees	20,000
Maximum | Common Stock | Keystone Capital Partners, LLC | Stock Purchase Agreement
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock issued under purchase agreement	$ 5,000,000
2011 Employee Equity Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional shares of common stock		297,743
2018 Omnibus Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total shares of common stock reserved			425,000		425,000
Percentage of total shares of common stock reserved					2.00%
2018 Omnibus Incentive Plan | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of voting power of all classes of stock to be owned by optionee to determine the exercise price					10.00%
Exercise price as a percentage of fair value of common stock on grant date if optionee owns stock representing more than 10 percent of voting power of all classes of stock					110.00%
Employee Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total unrecognized compensation cost related to stock options granted to employees, weighted-average recognition period					2 years 11 months 12 days		2 years 4 months 20 days
Employee Stock Options | 2011 Employee Equity Plan | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted, expiration year					5 years
Employee Stock Options | 2011 Employee Equity Plan | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted, expiration year					10 years
Employee Stock Options | 2018 Omnibus Incentive Plan | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted, expiration year					5 years
Employee Stock Options | 2018 Omnibus Incentive Plan | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted, expiration year					10 years