STOCKHOLDERS' EQUITY (DEFICIT) - Common Stock (Details) - $ / shares	Mar. 31, 2020	Dec. 31, 2019
Equity [Abstract]
Common stock, shares authorized (in shares)	200,000,000.0	200,000,000
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares issued (in shares)	109,991,553	106,801,409
Common stock, shares outstanding (in shares)	109,991,553	106,801,409