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Balance Sheet Account Detail (Fair Value Measurements) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Nov. 02, 2015
Dec. 10, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents $ 48,020 $ 57,991    
Restricted cash 2,067 2,608    
Contingently issuable common stock $ 8,200 9,300    
2.25% Convertible Senior Notes | Convertible Debt        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Stated interest rate 2.25%     2.25%
3.25% Convertible Senior Notes | Convertible Debt        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Stated interest rate     3.25%  
Facility Agreement | Secured Debt        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Stated interest rate 6.87%      
Quoted prices in active markets for identical assets (Level 1) | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents $ 48,020 57,991    
Restricted cash 2,067 2,608    
Contingently issuable common stock 0 0    
Significant other observable inputs (Level 2) | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 0 0    
Restricted cash 0 0    
Contingently issuable common stock 0 0    
Significant other observable inputs (Level 2) | Fair Value, Measurements, Nonrecurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value of long-term debt 128,000 131,200    
Significant unobservable inputs (Level 3) | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 0 0    
Restricted cash 0 0    
Contingently issuable common stock 8,200 $ 9,300    
Significant unobservable inputs (Level 3) | Fair Value, Measurements, Nonrecurring | Facility Agreement | Secured Debt        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value of long-term debt $ 103,200