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Investments (Tables)
 3 Months Ended
Mar. 31, 2016
Investments, All Other Investments [Abstract]  
Available-for-sale investments
The following tables summarize the Company’s available-for-sale investments at March 31, 2016 and December 31, 2015 (in thousands):

AVAILABLE-FOR-SALE INVESTMENTS
March 31, 2016
(in thousands)
 
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair Value
Asset-backed securities
$
6,078

$
8

$
—

$
6,086

US government & agency securities
19,098

15

(1
)
19,112

Corporate notes, bonds and commercial paper
15,303

22

(3
)
15,322

Certificates of deposit
4,110

—

—

4,110

Total
$
44,589

$
45

$
(4
)
$
44,630


AVAILABLE-FOR-SALE INVESTMENTS
December 31, 2015
(in thousands)
 
Amortized Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair Value
Asset-backed securities
$
2,510

$
—

$
(3
)
$
2,507

Corporate notes and bonds
9,341

1

(10
)
9,332

Total
$
11,851

$
1

$
(13
)
$
11,839


The following table summarizes the maturities of the Company’s available-for-sale securities at March 31, 2016 and December 31, 2015 (in thousands):

AVAILABLE-FOR-SALE INVESTMENT MATURITIES
(in thousands)
 
March 31, 2016
December 31, 2015
 
Amortized
Cost
Fair Value
Amortized
Cost
Fair Value
Due in less than 1 year
$
14,149

$
14,156

$
11,851

$
11,839

Due in 1-5 years
29,435

29,467

—

—

Due in 6-10 years
1,005

1,007

—

—

Total
$
44,589

$
44,630

$
11,851

$
11,839