XML 44 R34.htm IDEA: XBRL DOCUMENT v3.7.0.1
Debt Instruments - Convertible Debt (Details)
 3 Months Ended 12 Months Ended
Dec. 21, 2016
USD ($)
$ / shares
shares
Dec. 15, 2016
$ / item
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Convertible Debt        
Equity component of the Convertible Notes       $ 88,300,000
Deferred tax liability in relation to the Convertible Notes       29,800,000
Convertible Notes | 2016 Convertible Notes        
Convertible Debt        
Aggregate principle amount $ 250,000,000      
Net proceeds after deducting fees and estimated expenses 243,100,000      
Net proceeds from convertible notes to pay capped call transactions $ 13,500,000      
Shares of common stock issued per increment of note principal | shares 40,849,675      
Debt conversion ratio (in shares) 0.1633987      
Increment used for debt conversion $ 1,000      
Conversion price (in dollars per share) | $ / shares $ 6.12      
Maximum calendar days allowed to holders of common stock rights options or warrants to purchase of common stock 60 days      
Trading days for price per share based on last reported sale price 10 days      
Minimum percentage of per share value of last reported sale price of common stock 10.00%      
Convertible notes issuance costs $ 7,500,000      
Convertible notes issuance cost paid $ 6,900,000      
Liability components of convertible notes        
Principle     $ 250,000,000 250,000,000
Less: debt discount     (88,546,000) (90,807,000)
Less: deferred financing     (4,595,000) (4,729,000)
Net carrying value of debt     156,859,000 $ 154,464,000
Fair value of the debt     336,900,000  
Interest Expense, Debt [Abstract]        
Contractual interest expense     1,887,000  
Amortization of deferred financing costs     142,000  
Amortization of debt discount     2,261,000  
Total interest expense     $ 4,290,000  
Effective interest rate of the liability component     10.85%  
Initial cap price | $ / item   7.20    
Capped call premium on closing price   50.00%    
Convertible Notes | 2016 Convertible Notes | Convertible Notes, condition 1        
Convertible Debt        
Threshold consecutive trading days 30 days      
Threshold percentage 130.00%      
Convertible Notes | 2016 Convertible Notes | Convertible Notes, condition 1 | Minimum        
Convertible Debt        
Threshold trading days 20 days      
Convertible Notes | 2016 Convertible Notes | Convertible Notes, condition 2        
Convertible Debt        
Increment used for debt conversion $ 1,000      
Threshold trading days 5 days      
Threshold consecutive trading days 5 days      
Maximum threshold percentage 98.00%      
Over-allotment Option | Private Placement Purchase Agreement | Convertible Notes | 2016 Convertible Notes        
Convertible Debt        
Aggregate principle amount $ 25,000,000