ORGANIZATION AND DESCRIPTION OF BUSINESS (Details) - USD ($) shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Accumulated deficit	$ (67,812,000)	$ (46,159,000)
Existing cash balances and investments	19,500,000
Cash used in operating activities	15,600,000
Maximum aggregate proceeds from public offerings	35,000,000.0
Sales of common stock, net of offering costs	15,950,000	$ 15,798,000
Capital Units
Class of Stock [Line Items]
Sales of common stock, net of offering costs	$ 11,500,000
Sales of common stock, net of offering costs (in shares)	2,715
Securities available for issuance	$ 23,500,000