Annual report pursuant to Section 13 and 15(d)

ORGANIZATION AND DESCRIPTION OF BUSINESS (Details)

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ORGANIZATION AND DESCRIPTION OF BUSINESS (Details) - USD ($)
shares in Thousands, $ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 22, 2017
Feb. 28, 2017
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Class of Stock [Line Items]          
Accumulated deficit     $ (46,159) $ (46,159) $ (30,912)
Existing cash balances and investments     9,800 9,800  
Cash used for operations per quarter     2,900    
Net proceeds from the sale of common stock from private placement offering       5,177 $ 0
Maximum aggregate proceeds from public offerings     35,000 35,000  
Sales of common stock, net of offering costs       15,798  
Capital Units          
Class of Stock [Line Items]          
Sales of common stock, net of offering costs       $ 11,500  
Sales of common stock, net of offering costs (in shares)       2,715  
Securities available for issuance     $ 23,500 $ 23,500  
Subsequent Event          
Class of Stock [Line Items]          
Net proceeds from the sale of common stock from private placement offering   $ 7,500      
Subsequent Event | Capital Units          
Class of Stock [Line Items]          
Net proceeds from the sale of common stock from private placement offering $ 7,500