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Liabilities (Tables)
6 Months Ended
Jun. 30, 2019
Liabilities  
Schedule of accrued expenses and other current liabilities

June 30,

December 31,

    

2019

    

2018

(in thousands)

Payroll and related benefits

$

14,768

$

20,486

Warranty

7,099

7,852

Operating lease liabilities

4,440

Interest

4,321

4,321

Professional fees

2,219

2,897

Sales, use, and other taxes

 

1,547

 

2,670

Restructuring liability

 

1,336

 

2,213

Other

 

7,067

 

6,011

Total

$

42,797

$

46,450

Schedule of changes in product warranty reserves

    

(in thousands)

Balance - December 31, 2018

$

7,852

Warranties issued

 

2,518

Consumption of reserves

 

(3,350)

Changes in estimate

 

79

Balance - June 30, 2019

$

7,099

Schedule of restructuring accrual activities

    

Personnel

    

Facility

    

Severance and

Related Costs

Related Costs

and Other

Total

(in thousands)

Balance - December 31, 2018

$

2,143

$

70

$

2,213

Provision

1,910

136

2,046

Payments

(2,717)

(206)

(2,923)

Balance - June 30, 2019

$

1,336

$

$

1,336

Schedule of changes in deferred revenue

(in thousands)

Balance - December 31, 2018

 

$

44,415

Deferral of revenue

 

12,012

Recognition of previously deferred revenue

 

(6,977)

Balance - June 30, 2019

 

$

49,450

Schedule of carrying value of Convertible Senior Notes

June 30,

December 31,

    

2019

    

2018

 

(in thousands)

Principal amount

$

345,000

$

345,000

Unamortized debt discount

 

(46,686)

 

(52,336)

Unamortized transaction costs

 

(4,703)

 

(5,272)

Net carrying value

$

293,611

$

287,392

Schedule of interest expense related to Convertible Senior Notes

Three months ended June 30,

Six months ended June 30,

    

2019

    

2018

    

2019

    

2018

 

(in thousands)

Cash Interest Expense

 

  

  

  

  

Coupon interest expense

$

2,329

$

2,329

$

4,658

$

4,658

Non-Cash Interest Expense

 

  

 

  

 

  

 

  

Amortization of debt discount

 

2,851

 

2,646

 

5,650

 

5,243

Amortization of transaction costs

 

287

 

266

 

569

 

528

Total Interest Expense

$

5,467

$

5,241

$

10,877

$

10,429