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Liabilities (Tables)
9 Months Ended
Sep. 30, 2020
Liabilities  
Schedule of accrued expenses and other current liabilities

September 30,

December 31,

    

2020

    

2019

(in thousands)

Payroll and related benefits

$

21,755

$

15,174

Warranty

5,141

7,067

Operating lease liabilities

4,177

4,196

Interest

3,189

4,321

Professional fees

963

2,443

Sales, use, and other taxes

 

2,466

 

811

Restructuring liability

 

671

 

2,841

Other

 

2,305

 

4,390

Total

$

40,667

$

41,243

Schedule of changes in product warranty reserves

(in thousands)

Balance - December 31, 2019

$

7,067

Warranties issued

 

2,747

Consumption of reserves

 

(4,771)

Changes in estimate

 

98

Balance - September 30, 2020

$

5,141

Schedule of restructuring accrual activities

    

(in thousands)

Balance - December 31, 2019

$

2,841

Provision

1,097

Payments

(3,267)

Balance - September 30, 2020

$

671

Schedule of changes in deferred revenue

(in thousands)

Balance - December 31, 2019

 

$

28,249

Deferral of revenue

 

7,391

Recognition of previously deferred revenue

 

(18,370)

Balance - September 30, 2020

 

$

17,270

Schedule of carrying value of Convertible Senior Notes

September 30, 2020

December 31, 2019

2023 Notes

2027 Notes

Total

2023 Notes

2027 Notes

Total

(in thousands)

Principal amount

$

256,695

$

125,000

$

381,695

$

345,000

$

$

345,000

Unamortized debt discount

 

(23,488)

 

(32,889)

 

(56,377)

 

(40,820)

 

 

(40,820)

Unamortized transaction costs

 

(2,366)

 

(2,134)

 

(4,500)

 

(4,112)

 

 

(4,112)

Net carrying value

$

230,841

$

89,977

$

320,818

$

300,068

$

$

300,068

Schedule of interest expense related to Convertible Senior Notes

Three months ended September 30,

Nine months ended September 30,

    

2020

    

2019

    

2020

    

2019

 

(in thousands)

Cash Interest Expense

 

  

  

  

  

Coupon interest expense - 2023 Notes

$

1,733

$

2,329

$

6,060

$

6,986

Coupon interest expense - 2027 Notes

1,172

1,745

Non-cash Interest Expense

 

  

 

  

 

  

 

  

Amortization of debt discount - 2023 Notes

 

2,328

 

2,906

 

8,074

 

8,556

Amortization of debt discount - 2027 Notes

884

1,310

Amortization of transaction costs - 2023 Notes

235

293

 

813

 

862

Amortization of transaction costs - 2027 Notes

 

57

 

 

85

 

Total Interest Expense

$

6,409

$

5,528

$

18,087

$

16,404