SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - At-The-Market Equity Offering Sales Agreement (Details) - USD ($)	Aug. 31, 2020	Sep. 30, 2020	Apr. 10, 2020	Dec. 31, 2019
Subsidiary, Sale of Stock [Line Items]
Common stock, par value (in dollars per share)		$ 0.001	$ 0.001	$ 0.001
At-The-Market Equity Offering
Subsidiary, Sale of Stock [Line Items]
Common stock, par value (in dollars per share)	$ 0.001
Percentage of commission on sale proceeds of stock	3.00%
Maximum | At-The-Market Equity Offering
Subsidiary, Sale of Stock [Line Items]
Aggregate offering price	$ 75,000,000