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Debt Obligations (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
1 Months Ended
Nov. 30, 2014
USD ($)
Mar. 31, 2021
USD ($)
shares
Dec. 31, 2020
shares
Sep. 28, 2020
USD ($)
Nov. 20, 2014
$ / shares
Debt Instrument [Line Items]          
Proceeds from Convertible Debt $ 87,500        
Conv Debt Instrument Interest Rate Stated Percentage         5.25%
Debt Instrument, Convertible, Conversion Ratio 118.4553        
Debt Instrument, Convertible, Conversion Price | $ / shares         $ 8.442
Debt Instrument, Fair Value Disclosure   $ 12,600      
Common stock, shares issued | shares   145,552 142,289    
Convertible debt exchange Remaining Notes   $ 11,700      
Convertible debt exchange - Total Principal Amount       $ 75,800