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DEBT - Private Placement of Convertible Notes Narrative (Details)
3 Months Ended
Mar. 17, 2017
USD ($)
day
instrument
d
$ / shares
shares
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Jun. 30, 2014
USD ($)
Debt Instrument [Line Items]        
Repayments of debt   $ 1,250,000 $ 1,000,000  
Extinguishment fees   0 578,000  
Loss on early extinguishment of debt   $ 0 $ 4,969,000  
Convertible Notes [Member]        
Debt Instrument [Line Items]        
Face amount       $ 25,000,000.0
Common stock, par value (in usd per share) | $ / shares $ 0.0001      
Payment of debt and extinguishment fees $ 5,600,000      
Repayments of debt 5,000,000      
Extinguishment fees 600,000      
Loss on early extinguishment of debt 5,000,000      
Non-cash write off related to settlement of convertible notes $ 46,000,000      
Debt conversion price (in usd per share) | $ / shares $ 7.10      
Debt instrument, convertible, number of equity instruments | instrument 3,521,126      
Debt Instrument, convertible, threshold period following issuance date (in years) 3 years      
Debt instrument, convertible, threshold percentage of stock price trigger 125.00%      
Debt instrument, convertible, threshold trading days | day 20      
Debt instrument, convertible, threshold consecutive trading days | d 30      
Interest rate (percent) 8.00%      
Common Stock [Member]        
Debt Instrument [Line Items]        
Shares issued (in shares) | shares 3,175,584      
8% Convertible Notes [Member] | Convertible Notes [Member]        
Debt Instrument [Line Items]        
Original debt amount in debt conversion $ 20,000,000      
Convertible Note Derivative Liability [Member] | Convertible Notes [Member]        
Debt Instrument [Line Items]        
Original debt amount in debt conversion $ 26,000,000