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Cash, cash equivalents and short-term investments (Tables)
 6 Months Ended
Jun. 30, 2016
Investments, Debt and Equity Securities [Abstract]  
Summary of cash, cash equivalents and short-term investments
The following tables summarize our cash, cash equivalents and short-term investments at June 30, 2016 and December 31, 2015 (in thousands):
 
June 30, 2016
Amortized Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Fair Value
Cash and money market funds
$
95,894

 
$
—

 
$
—

 
$
95,894

Corporate debt securities
0

 
0

 
0

 
0

Due in one year or less
50,549

 
17

 
(10
)
 
50,556

Due in two years or less
1,201

 
2

 
—

 
1,203

Total
$
147,644

 
$
19

 
$
(10
)
 
$
147,653

Reported as:
 

 
 

 
 

 
 

Cash and cash equivalents
$
95,894

 
$
—

 
$
—

 
$
95,894

Short-term investments
51,750

 
19

 
(10
)
 
51,759

Total
$
147,644

 
$
19

 
$
(10
)
 
$
147,653

December 31, 2015
Amortized Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Fair Value
Cash and money market funds
$
43,224

 
$
—

 
$
—

 
$
43,224

Corporate debt securities
0

 
0

 
0

 
0

Due in one year or less
68,898

 
—

 
(107
)
 
68,791

Due in two years or less
14,710

 
—

 
(63
)
 
14,647

Total
$
126,832

 
$
—

 
$
(170
)
 
$
126,662

Reported as:
 

 
 

 
 

 
 

Cash and cash equivalents
$
43,224

 
$
—

 
$
—

 
$
43,224

Short-term investments
83,608

 
—

 
(170
)
 
83,438

Total
$
126,832

 
$
—

 
$
(170
)
 
$
126,662