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Notes Payable (Tables)
6 Months Ended
Jun. 30, 2020
Table Text Blocks  
Schedule of outstanding Convertible Note

The Company’s outstanding balances for the convertible senior notes as of June 30, 2020 and December 31, 2019 consisted of the following (in thousands):

​

​

​

​

​

​

​

​

​

​

June 30, 2020

​

December 31, 2019

​

Liability component:

    

​

​

​

​

​

​

Principal:

    

​

​

​

​

​

​

2022 Convertible Notes

​

$

120,699

​

$

120,699

​

2024 Convertible Notes

​

​

200,000

​

​

200,000

​

2026 Convertible Notes

​

​

200,000

​

​

200,000

​

Less: unamortized debt discount

​

​

(94,475)

​

​

(104,700)

​

Less: unamortized debt issuance costs

​

​

(7,300)

​

​

(8,005)

​

Net carrying amount

​

$

418,924

​

$

407,994

​

Equity component:

​

​

​

​

​

​

​

2022 Convertible Notes

​

​

19,807

​

​

19,807

​

2024 Convertible Notes

​

​

41,152

​

​

41,152

​

2026 Convertible Notes

​

​

51,350

​

​

51,350

​

Total equity component

​

$

112,309

​

$

112,309

​

​

Schedule of interest expense related to Convertible Notes

The following table sets forth total interest expense recognized related to convertible senior notes during the three and six months ended June 30, 2020 and 2019 (in thousands):

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​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Three Months Ended

​

Six Months Ended

​

​

​

​

June 30, 

​

June 30, 

​

​

​

    

2020

    

2019

    

2020

    

2019

    

 

Contractual interest expense

​

$

1,802

​

$

1,889

​

$

3,609

​

$

3,777

​

​

Amortization of debt issuance costs

​

​

360

​

​

283

​

​

705

​

​

555

​

​

Amortization of debt discount

​

​

5,156

​

​

4,164

​

​

10,224

​

​

8,239

​

​

Total interest expense

​

$

7,318

​

$

6,336

​

$

14,538

​

$

12,571

​

​

Schedule of future minimum payments details of debt Future minimum payments under the convertible senior notes as of June 30, 2020 are as follows (in thousands):

​

​

​

​

​

​

2020(1)

​

$

3,608

​

2021

​

​

7,216

​

2022

​

​

126,556

​

2023

​

​

4,500

​

2024

​

​

203,750

​

2025

​

​

3,000

​

2026 and Thereafter

​

​

201,500

​

Total future minimum payments under the convertible senior notes

 

​

550,130

​

Less: amounts representing interest

​

​

(29,431)

​

Less: unamortized debt discount

​

​

(94,475)

​

Less: unamortized debt issuance costs

​

​

(7,300)

​

Convertible senior notes balance

​

$

418,924

​

(1) For the six months ending December 31, 2020.