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Balance sheet components (Tables)
6 Months Ended
Jun. 30, 2019
Balance Sheet Related Disclosures [Abstract]  
Accounts receivable, Net
Accounts receivable, net, consists of the following (in thousands):
 
June 30, 2019
 
December 31, 2018
Accounts receivable
$
57,471

 
$
74,343

Trade notes receivable
2,409

 
672

Allowance for doubtful accounts
(257
)
 
(264
)
 
$
59,623

 
$
74,751

Inventories, net
Inventories, net, consist of the following (in thousands): 
 
June 30, 2019
 
December 31, 2018
Raw materials
$
24,083

 
$
27,806

Work in process
14,892

 
13,044

Finished goods(1)
9,820

 
11,309

 
$
48,795

 
$
52,159

________________________________________________________

(1)
Finished goods inventory at customer vendor managed inventory locations was $2.8 million and $5.6 million as of June 30, 2019 and December 31, 2018, respectively.
Prepaid expenses and other current assets
Prepaid expenses and other current assets consist of the following (in thousands):
 
June 30, 2019
 
December 31, 2018
Prepaid taxes and taxes receivable
$
4,130

 
$
5,461

Transition services agreement receivable (see Note 6)
12,016

 
11,999

Deposits and other prepaid expenses
2,424

 
3,020

Other receivable
4,827

 
6,125

 
$
23,397

 
$
26,605

Purchased intangible assets
Purchased intangible assets consist of the following (in thousands): 
 
June 30, 2019
 
December 31, 2018
 
Gross
Assets
 
Accumulated
Amortization
 
Net
Assets
 
Gross
Assets
 
Accumulated
Amortization
 
Net
Assets
Technology and patents
$
37,048

 
$
(35,368
)
 
$
1,680

 
$
37,029

 
$
(34,995
)
 
$
2,034

Customer relationships
15,172

 
(15,172
)
 

 
15,146

 
(15,026
)
 
120

Leasehold interest
1,240

 
(388
)
 
852

 
1,238

 
(374
)
 
864

 
$
53,460

 
$
(50,928
)
 
$
2,532

 
$
53,413

 
$
(50,395
)
 
$
3,018

Amortization expense of purchased intangible assets
The following table presents details of the amortization expense of the Company’s purchased intangible assets as reported in the condensed consolidated statements of operations (in thousands):
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2019
 
2018
 
2019
 
2018
Cost of goods sold
$
184

 
$
184

 
$
368

 
$
387

Operating expenses

 
120

 
119

 
239

Total
$
184

 
$
304

 
$
487

 
$
626

Estimated future amortization expense of purchased intangible assets
The estimated future amortization expense of purchased intangible assets as of June 30, 2019, is as follows (in thousands): 
2019 (remaining six months)
$
368

2020
737

2021
644

2022
28

2023
28

Thereafter
727

 
$
2,532

Accrued and other current liabilities
Accrued and other current liabilities consist of the following (in thousands): 
 
June 30, 2019
 
December 31, 2018
Transition services agreement payables (see Note 6)
$
11,769

 
$
11,769

Employee-related
12,905

 
14,899

Asset sale related contingent liabilities (see Note 6)
6,762

 
6,751

Operating lease liabilities, current
2,223

 

Accrued warranty
751

 
672

Deferred revenue, current
291

 
1,114

Income and other taxes payable
1,107

 
1,580

Rusnano payment derivative

 
2,000

Accrued litigation settlement

 
2,645

Other accrued expenses
7,212

 
8,858

 
$
43,020

 
$
50,288

Warranty accrual
The table below summarizes the movement in the warranty accrual, which is included in accrued and other current liabilities (in thousands):
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2019
 
2018
 
2019
 
2018
Beginning balance
$
739

 
$
1,699

 
$
672

 
$
1,334

Warranty accruals
161

 
(17
)
 
476

 
529

Settlements
(149
)
 
(90
)
 
(397
)
 
(271
)
Ending balance
$
751

 
$
1,592

 
$
751

 
$
1,592

Other noncurrent liabilities
Other noncurrent liabilities consist of the following (in thousands): 
 
June 30, 2019
 
December 31, 2018
Pension and other employee-related
$
4,113

 
$
4,529

Deferred rent

 
3,058

Government grant
2,333

 
2,108

Capital lease obligation

 
282

Asset retirement obligations and other
3,503

 
3,522

 
$
9,949

 
$
13,499