SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Stockholders' Equity (Details)	Apr. 21, 2020 Right	Apr. 10, 2020 Right $ / shares	Jun. 30, 2020 $ / shares shares	Jun. 12, 2020 shares	Jun. 11, 2020 shares	Dec. 31, 2019 $ / shares shares
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Common stock, authorized (in shares) | shares			15,000,000	15,000,000	10,000,000	15,000,000
Dividend of preferred share purchase right		1
Common stock, par value (in dollars per share) | $ / shares		$ 0.001	$ 0.001			$ 0.001
Number of rights to be issued with each common share issued	1
Ownership percentage acquired that would trigger the Rights Agreement			20