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STOCKHOLDERS' DEFICIT - Activity Related to Series A and C Preferred Stock (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2016
USD ($)
Series A Preferred Stock  
Increase (Decrease) in Temporary Equity [Roll Forward]  
Beginning Balance $ 62,918
Exchange of shares - Series A to Series C (60,776)
Accretion of discount related to issuance costs 38
Dividends recorded 206
Ending Balance 2,386
Series C Preferred Stock  
Increase (Decrease) in Temporary Equity [Roll Forward]  
Beginning Balance 0
Exchange of shares - Series A to Series C 60,776
Accretion of discount related to issuance costs 480
Dividends recorded 5,986
Ending Balance $ 67,242