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Cash, cash equivalents and short-term investments (Tables)
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
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 as of June 30, 2018 and December 31, 2017 (in thousands):
 
June 30, 2018
 
Amortized Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Fair Value
Cash and money market funds
 
$
24,601

 
$
—

 
$
—

 
$
24,601

Corporate debt
 


 


 


 


Due in one year or less
 
21,054

 
—

 
(8
)
 
21,046

U.S. government securities
 
 
 
 
 
 
 
 
Due in one year or less
 
7,982

 
—

 
(1
)
 
7,981

Total
 
$
53,637

 
$
—

 
$
(9
)
 
$
53,628

Reported as:
 
 

 
 

 
 

 
 

Cash and cash equivalents
 
$
24,601

 
$
—

 
$
—

 
$
24,601

Short-term investments
 
29,036

 
—

 
(9
)
 
29,027

Total
 
$
53,637

 
$
—

 
$
(9
)
 
$
53,628

December 31, 2017
 
Amortized Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Fair Value
Cash and money market funds
 
$
15,703

 
$
—

 
$
—

 
$
15,703

Corporate debt
 


 


 


 


Due in one year or less
 
38,053

 
—

 
(21
)
 
38,032

U.S. government securities
 
 
 
 
 
 
 
 
Due in one year or less
 
13,474

 
—

 
(6
)
 
13,468

Total
 
$
67,230

 
$
—

 
$
(27
)
 
$
67,203

Reported as:
 
 

 
 

 
 

 
 

Cash and cash equivalents
 
$
15,703

 
$
—

 
$
—

 
$
15,703

Short-term investments
 
51,527

 
—

 
(27
)
 
51,500

Total
 
$
67,230

 
$
—

 
$
(27
)
 
$
67,203
The following tables summarize our cash, cash equivalents and short-term investments as of December 31, 2017 and 2016 (in thousands):
December 31, 2017
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
Cash and money market funds
$
15,703

 
$
—

 
$
—

 
$
15,703

Corporate debt securities:
 
 
 
 
 
 
 
Due in one year or less
38,053

 
—

 
(21
)
 
38,032

U.S. government securities:
 
 
 
 
 
 
 
Due in one year or less
13,474

 
—

 
(6
)
 
13,468

Total
$
67,230

 
$
—

 
$
(27
)
 
$
67,203

Reported as:
 
 
 
 
 
 
 
Cash and cash equivalents
$
15,703

 
$
—

 
$
—

 
$
15,703

Short-term investments
51,527

 
—

 
(27
)
 
51,500

Total
$
67,230

 
$
—

 
$
(27
)
 
$
67,203

December 31, 2016
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
Cash and money market funds
$
43,930

 
$
—

 
$
—

 
$
43,930

Corporate debt securities:
 
 
 
 
 
 
 
Due in one year or less
48,492

 
3

 
(29
)
 
48,466

U.S. government securities:
 
 
 
 
 
 
 
Due in one year or less
14,013

 
—

 
(16
)
 
13,997

Due in two years or less
8,013

 
—

 
(18
)
 
7,995

Total
$
114,448

 
$
3

 
$
(63
)
 
$
114,388

Reported as:
 
 
 
 
 
 
 
Cash and cash equivalents
$
43,930

 
$
—

 
$
—

 
$
43,930

Short-term investments
70,518

 
3

 
(63
)
 
70,458

Total
$
114,448

 
$
3

 
$
(63
)
 
$
114,388