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Convertible Notes - 2014 Notes (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 31, 2015
USD ($)
Aug. 09, 2013
Note
May. 23, 2013
Note
Mar. 28, 2013
Note
Dec. 07, 2012
Note
Dec. 31, 2015
USD ($)
d
$ / shares
Dec. 31, 2014
USD ($)
Oct. 30, 2013
$ / shares
Debt Instrument [Line Items]                
Maturity period for 2014 convertible notes           7 years    
Conversion price of notes (in dollars per share) | $ / shares               $ 10.00
Unamortized debt discounts           $ 2,146    
Convertible debt                
Debt Instrument [Line Items]                
Legal fees $ 1,300              
Initial conversion rate           0.04032    
Maximum increase to initial conversion rate           0.01207    
Unamortized debt discounts           $ 1,800    
Convertible debt | 2014 Notes                
Debt Instrument [Line Items]                
Convertible notes, interest rate           1.75%    
Debt instrument, convertible, stock price trigger (in dollars per share) | $ / shares           $ 30    
Debt instrument, convertible, threshold trading days | d           30    
Transaction fee for debt issuance 625              
Debt instrument, fee amount $ 250              
Ownership cap for holder and affiliates, percentage           9.985%    
Conversion price of notes (in dollars per share) | $ / shares           $ 24.80    
Initial conversion, premium over closing price           30.00%    
Default provisions, qualifying percentage of ownership           50.00%    
Interest expense related to 2014 convertible note           $ 2,200 $ 600  
Subsidiaries | Convertible debt                
Debt Instrument [Line Items]                
Percentage of voting rights pledged as collateral 65.00%              
Convertible debt | 2012 Notes                
Debt Instrument [Line Items]                
Convertible notes, interest rate         8.00%      
Number of individual convertible notes | Note   5 5 5 5      
Convertible debt | 2014 Notes                
Debt Instrument [Line Items]                
Ownership cap for holder and affiliates, percentage           9.985%