Annual report pursuant to Section 13 and 15(d)

STOCKHOLDERS' EQUITY - Controlled Equity Offering (Details)

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STOCKHOLDERS' EQUITY - Controlled Equity Offering (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended 17 Months Ended
Aug. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Controlled Equity Offering        
Number of shares of common stock sold (in shares)       9,617,875
Aggregate proceeds   $ 23,586 $ 5,292 $ 30,000
Value of shares registered for sale   $ 0    
Common stock        
Controlled Equity Offering        
Number of shares of common stock sold (in shares)   7,895,563 1,722,312  
Cantor | Common stock        
Controlled Equity Offering        
Maximum value of shares available under Controlled Equity Offering $ 30,000