XML 96 R80.htm IDEA: XBRL DOCUMENT v3.21.2
Convertible Notes - Summary of the carrying value of the convertible notes (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Principal amount $ 325,000 $ 175,000
Plus: premium 250 250
Gross proceeds 325,250 175,250
Less: Unamortized discount (1) [1] 0 (4,207)
Less: Unamortized issuance costs(1) [1] (7,271) (4,397)
Carrying amount $ 317,979 $ 166,646
Effective interest rate(2) [2] 4.60% 6.29%
2021 Notes    
Debt Instrument [Line Items]    
Principal amount $ 150,000  
Plus: premium 0  
Gross proceeds 150,000  
Less: Unamortized discount (1) [1] 0  
Less: Unamortized issuance costs(1) [1] (4,045)  
Carrying amount $ 145,955  
Effective interest rate(2) [2] 3.83%  
2020 Notes    
Debt Instrument [Line Items]    
Principal amount $ 175,000  
Plus: premium 250  
Gross proceeds 175,250  
Less: Unamortized discount (1) [1] 0  
Less: Unamortized issuance costs(1) [1] (3,226)  
Carrying amount $ 172,024  
Effective interest rate(2) [2] 5.26%  
[1] Unamortized discount was reduced by $4,207 and unamortized issuance costs increased by $119 upon the early adoption of ASU 2020-06 on January 1, 2021. The discount previously arose from the bifurcation of the conversion option which occurred prior to the adoption of ASU 2020-06. The unamortized issuance costs are reported net of the unamortized premium.
[2] Includes amortization of the issuance costs and premium. The effective interest rate prior to January 1, 2021 also included amortization of the discount arising from the bifurcation of the conversion option.