Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY - Common Stock (Details)

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STOCKHOLDERS' EQUITY - Common Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Jul. 21, 2017
Jun. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Jun. 29, 2017
Jun. 19, 2017
Dec. 31, 2016
Subsidiary, Sale of Stock [Line Items]              
Common stock, par value (in dollars per share)   $ 0.0001 $ 0.0001       $ 0.0001
Proceeds from common stock issuance     $ 11,951 $ 0      
Underwriting Agreement              
Subsidiary, Sale of Stock [Line Items]              
Proceeds from common stock issuance   $ 10,400          
Over-allotment option              
Subsidiary, Sale of Stock [Line Items]              
Proceeds from common stock issuance   $ 1,600          
Common stock | Underwriting Agreement              
Subsidiary, Sale of Stock [Line Items]              
New share issues (in shares)   3,600,000          
Price per share (in dollars per share)   $ 3.15          
Price per share, net proceeds (in dollars per share)   $ 2.90          
Common stock | Over-allotment option              
Subsidiary, Sale of Stock [Line Items]              
New share issues (in shares)   540,000          
Common Stock Warrant              
Subsidiary, Sale of Stock [Line Items]              
Common stock, par value (in dollars per share)     $ 0.0001        
Soryn HLDR | Common Stock Warrant              
Subsidiary, Sale of Stock [Line Items]              
Exercise price (in dollars per share)     $ 3.18     $ 3.18  
Soryn HLDR | Common Stock Warrant | Common stock              
Subsidiary, Sale of Stock [Line Items]              
Common stock warrant purchased (in shares)   2,300,000     2,000,000 2,355,506  
Soryn HLDR | Common Stock Warrant | Common stock | Over-allotment option              
Subsidiary, Sale of Stock [Line Items]              
Number of share called by warrant, increase 50,000