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Investments (Tables)
 3 Months Ended
Mar. 31, 2017
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 March 31, 2017
 
Maturity
 
Amortized cost
Gross unrealized gains
Gross unrealized losses
Estimated fair value
Corporate debt securities
1 year or less
 
$
36,350

$
1

$
(5
)
$
36,346

Commercial paper
1 year or less
 
39,268

89

—

39,357

 
 
 
$
75,618

$
90

$
(5
)
$
75,703

 
 
 
As of December 31, 2016
 
Maturity
 
Amortized cost
Gross unrealized gains
Gross unrealized losses
Estimated fair value
Corporate debt securities
1 year or less
 
$
20,622

$
—

$
(3
)
$
20,619

Commercial paper
1 year or less
 
13,717

15

—

13,732

 
 
 
$
34,339

$
15

$
(3
)
$
34,351