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Investments (Tables)
 6 Months Ended
Jun. 30, 2016
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-sale Securities Reconciliation
The following tables summarize our short-term investments (dollars in thousands):
 
 
 
As of June 30, 2016
 
Maturity
 
Amortized cost
Gross unrealized gains
Gross unrealized losses
Estimated fair value
Corporate debt securities
1 year or less
 
$
27,184

$
—

$
—

$
27,184

Commercial paper
1 year or less
 
39,488

99

—

39,587

 
 
 
$
66,672

$
99

$
—

$
66,771

 
 
 
As of December 31, 2015
 
Maturity
 
Amortized cost
Gross unrealized gains
Gross unrealized losses
Estimated fair value
Corporate debt securities
1 year or less
 
$
27,644

$
—

$
(22
)
$
27,622

Commercial paper
1 year or less
 
45,158

54

—

45,212

 
 
 
$
72,802

$
54

$
(22
)
$
72,834