| Summary of the Company's cash equivalents and investments |
|
|
|
December 31, 2014
|
|
|
|
|
Amortized
Cost
|
|
Gross
Unrealized
Gains
|
|
Gross
Unrealized
Losses
|
|
Estimated
Fair
Value
|
|
|
|
|
(in thousands)
|
|
|
Cash equivalents:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Money market funds
|
|
$
|
357
|
|
$
|
—
|
|
$
|
—
|
|
$
|
357
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Short-term investments:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Certificates of deposit
|
|
|
2,934
|
|
|
—
|
|
|
—
|
|
|
2,934
|
|
|
U.S treasury notes
|
|
|
9,020
|
|
|
4
|
|
|
—
|
|
|
9,024
|
|
|
U.S. government agency securities
|
|
|
8,853
|
|
|
—
|
|
|
(8
|
)
|
|
8,845
|
|
|
Long-term investments:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Certificates of deposit
|
|
|
1,848
|
|
|
—
|
|
|
—
|
|
|
1,848
|
|
|
U.S. treasury notes
|
|
|
2,494
|
|
|
—
|
|
|
(5
|
)
|
|
2,489
|
|
|
U.S. government agency securities
|
|
|
31,454
|
|
|
—
|
|
|
(50
|
)
|
|
31,404
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Total
|
|
$
|
56,960
|
|
$
|
4
|
|
$
|
(63
|
)
|
$
|
56,901
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
December 31, 2013
|
|
|
|
|
Amortized
Cost
|
|
Gross
Unrealized
Gains
|
|
Gross
Unrealized
Losses
|
|
Estimated
Fair
Value
|
|
|
|
|
(in thousands)
|
|
|
Cash equivalents:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Money market funds
|
|
$
|
5,356
|
|
$
|
—
|
|
$
|
—
|
|
$
|
5,356
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Short-term investments:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
U.S treasury notes
|
|
|
2,071
|
|
|
—
|
|
|
—
|
|
|
2,071
|
|
|
U.S. government agency securities
|
|
|
1,454
|
|
|
—
|
|
|
—
|
|
|
1,454
|
|
|
Long-term investments:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Certificates of deposit
|
|
|
238
|
|
|
—
|
|
|
—
|
|
|
238
|
|
|
U.S. treasury notes
|
|
|
9,116
|
|
|
3
|
|
|
(2
|
)
|
|
9,117
|
|
|
U.S. government agency securities
|
|
|
8,187
|
|
|
1
|
|
|
(5
|
)
|
|
8,183
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Total
|
|
$
|
26,422
|
|
$
|
4
|
|
$
|
(7
|
)
|
$
|
26,419
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
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