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Property, Plant and Equipment and Leases (Tables)
12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Estimated useful lives by each type of asset category are as follows:
 
 
Years
Buildings
 
Up to 39
Leasehold improvements
 
Lesser of (i) expected useful life of improvement or (ii) life of lease (including likely extension thereof)
Machinery and equipment
 
1 to 10
Property, plant and equipment by type were as follows:
(in thousands)
 
As of December 31,
 
 
 
 
 
 
2015
 
2014
Property, Plant and Equipment
 
2017
 
2016
 
(Restated)
 
(Restated)
Land
 
$

 
$

 
$
260

 
$
260

Buildings
 

 

 
1,471

 
1,471

Leasehold improvements
 
6,320

 
6,199

 
6,450

 
3,333

Machinery and equipment
 
27,379

 
24,490

 
23,523

 
17,500

Construction in progress
 
2,036

 
2,084

 
2,466

 
3,566

Total property, plant and equipment, at cost
 
35,735

 
32,773

 
34,170

 
26,130

Accumulated depreciation
 
(16,775
)
 
(12,646
)
 
(11,361
)
 
(8,176
)
Property, plant and equipment, net
 
$
18,960

 
$
20,127

 
$
22,809

 
$
17,954

Schedule of Future Minimum Lease Payments
The future minimum lease payments due under operating and capital leases in effect, as amended and extended, as of December 31, 2017, were as follows:
(in thousands)
 
Operating
 
 Capital
2018
 
$
4,341

 
$
22

2019
 
4,136

 
21

2020
 
3,786

 
20

2021
 
3,482

 
20

2022
 
3,578

 
19

2023 and beyond
 
3,202

 
51

Total
 
$
22,525

 
$
153