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0.25% Convertible Senior Notes, Convertible Note Hedge and Warrant (Tables)
 3 Months Ended
Mar. 31, 2018
Debt Instrument [Line Items]  
Schedule of Interest Expense

 

 

 

 

Interest expense related to the 2022 Notes is as follows:

 

 

Three Months Ended March 31,

 

 

2018

 

 

2017

 

 

(in thousands)

 

Contractual interest expense

$

250

 

 

$

—

 

Amortization of debt discount

 

4,567

 

 

 

—

 

Amortization of issuance costs

 

341

 

 

 

—

 

Total interest expense

$

5,158

 

 

$

—

 

 
0.25% Convertible Senior Notes Due 2022 as Liability Component [Member]  
Debt Instrument [Line Items]  
Schedule of Net Carrying Amount of Notes

The net carrying amount of the liability component of the 2022 Notes is as follows:

 

 

As of March 31, 2018

 

 

As of December 31, 2017

 

 

(in thousands)

 

Principal

$

400,000

 

 

$

400,000

 

Unamortized debt discount

 

(89,931

)

 

 

(94,498

)

Unamortized issuance costs

 

(6,714

)

 

 

(7,055

)

Net carrying amount

$

303,355

 

 

$

298,447