Annual report pursuant to Section 13 and 15(d)

Convertible Senior Notes (Details)

v3.20.4
Convertible Senior Notes (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument, Redemption [Line Items]      
Convertible senior notes   $ 286,183 $ 284,954
Maturity Year 2022      
Debt Instrument, Redemption [Line Items]      
Proceeds from convertible senior notes $ 282,200    
Convertible senior notes conversion ratio   0.0632040 0.0631793
Convertible Debt [Member] | Maturity Year 2022      
Debt Instrument, Redemption [Line Items]      
Aggregate principal amount   $ 287,500  
Convertible senior notes interest rate per annum   6.25%