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Significant Accounting Policies - Additional Information (Details)
12 Months Ended
Oct. 08, 2013
Dec. 31, 2015
USD ($)
Financial_Institution
Segment
$ / shares
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Significant Accounting Policies [Line Items]        
Number of operating segments | Segment   1    
Reverse stock split, conversion ratio 0.2      
Cash equivalents maturity period   3 months    
Amount insured by FDIC   $ 250,000    
Tax benefits recognized for stock-based compensation   462,978 $ 0 $ 0
Realized gains (losses) recognized from investment   0 0 0
Interest or penalties recognized for uncertain tax positions   0 0 $ 0
Interest or penalties accrued for uncertain tax positions   $ 0 0  
Warrants exercise price (in dollars per share) | $ / shares   $ 0.05    
Convertible debt | 2014 Notes        
Significant Accounting Policies [Line Items]        
Ownership cap for holder and affiliates, percentage   9.985%    
Domestic tax authority        
Significant Accounting Policies [Line Items]        
Operating loss carry-forwards   $ 61,100,000    
Convertible debt | 2014 Notes        
Significant Accounting Policies [Line Items]        
Long-term debt, fair value   $ 140,100,000 163,800,000  
Ownership cap for holder and affiliates, percentage   9.985%    
United States        
Significant Accounting Policies [Line Items]        
Number of financial institutions | Financial_Institution   6    
Europe        
Significant Accounting Policies [Line Items]        
Number of financial institutions | Financial_Institution   2    
Software and Software Development Costs        
Significant Accounting Policies [Line Items]        
Amortization period for capitalized software cost   3 years    
New Accounting Pronouncement, Early Adoption, Effect | Long-term Debt        
Significant Accounting Policies [Line Items]        
Reclassification of other assets to direct deduction from the carrying amount of convertible notes     $ 1,300,000  
New Accounting Pronouncement, Early Adoption, Effect | Other Assets        
Significant Accounting Policies [Line Items]        
Reclassification of other assets to direct deduction from the carrying amount of convertible notes   $ (1,300,000)