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Financial Statement Details (Tables)
 12 Months Ended
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Summary of Inventories
Inventories consist of the following (in thousands):
 
December 31,
 
2017
 
2016
Finished goods
$
14,331

 
$
19,277

Raw materials and components
6,072

 
11,865

 
$
20,403

 
$
31,142
Summary of Property, Plant and Equipment and Rental Assets
Rental assets consist of the following (in thousands):
 
December 31,
 
2017
 
2016
Rental assets
$
16,602

 
$
11,115

Less—accumulated depreciation
(9,039
)
 
(4,112
)
 
$
7,563

 
$
7,003

Property, plant and equipment consists of the following (in thousands):
 
December 31,
 
2017
 
2016
Land
$
288

 
$
260

Buildings
2,614

 
2,363

Test equipment
23,396

 
23,115

Computer equipment and purchased software
5,548

 
4,373

Product tooling
449

 
409

Furniture and fixtures
564

 
915

Vehicles
2,003

 
1,746

Leasehold improvements
267

 
243

 
35,129

 
33,424

Less—accumulated depreciation and amortization
(28,138
)
 
(25,032
)
 
$
6,991

 
$
8,392
Summary of Accrued Expenses and Other Current Liabilities
Accrued expenses and other current liabilities consist of the following (in thousands):
 
December 31,
 
2017
 
2016
Royalties
$
1,558

 
$
1,544

Payroll and related expenses
2,870

 
5,315

Warranty obligations
400

 
480

Market development funds and price protection
34

 
320

Professional fees
1,789

 
4,793

Bank overdrafts
117

 
489

Accrued interest
239

 
275

Deferred revenue
1,823

 
1,656

Restructuring
964

 
837

Acquisition-related liabilities
13,186

 
7,912

Divestiture-related liabilities
—

 
463

Other
4,578

 
3,813

 
$
27,558

 
$
27,897