Fair Value Measurements (Tables)
|
12 Months Ended |
Dec. 31, 2016 |
Fair Value Disclosures [Abstract] |
|
Summary of Changes in Fair Value of Level 3 Financial Liabilities |
The following table presents the changes in fair value of our total Level 3 financial liabilities for the year ended December 31, 2016. During the twelve months ended December 31, 2016, no common stock warrants were issued that were classified as liabilities (in thousands):
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|
Liability at
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|
|
|
|
|
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Unrealized
|
|
|
Liability at
|
|
|
|
December 31,
|
|
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Issuance of
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|
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Gain on
|
|
|
December 31,
|
|
|
|
2015
|
|
|
Warrants
|
|
|
warrants
|
|
|
2016
|
|
Warrant liability
|
|
$
|
1,105
|
|
|
$
|
—
|
|
|
$
|
(873
|
)
|
|
$
|
232
|
|
|
Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis |
The following table presents information about our assets and liabilities that are measured at fair value on a recurring basis, and indicates the fair value hierarchy of the valuation techniques we utilized to determine such fair value (in thousands):
December 31, 2016
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|
Level 1
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Level 2
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|
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Level 3
|
|
|
Total
|
|
Assets
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Cash
|
|
$
|
1,800
|
|
|
$
|
—
|
|
|
$
|
—
|
|
|
$
|
1,800
|
|
Money market securities (cash equivalents)
|
|
|
11,931
|
|
|
|
—
|
|
|
|
—
|
|
|
|
11,931
|
|
Corporate bonds and commercial paper (cash equivalents)
|
|
|
1,502
|
|
|
|
—
|
|
|
|
—
|
|
|
|
1,502
|
|
Government securities
|
|
|
2,000
|
|
|
|
—
|
|
|
|
—
|
|
|
|
2,000
|
|
Restricted cash (Note 12)
|
|
|
272
|
|
|
|
—
|
|
|
|
—
|
|
|
|
272
|
|
Corporate bonds and commercial paper (short term investments)
|
|
|
—
|
|
|
|
8,230
|
|
|
|
—
|
|
|
|
8,230
|
|
Total assets
|
|
$
|
17,505
|
|
|
$
|
8,230
|
|
|
$
|
—
|
|
|
$
|
25,735
|
|
Liabilities
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Warrants
|
|
$
|
—
|
|
|
$
|
—
|
|
|
$
|
232
|
|
|
$
|
232
|
|
December 31, 2015
|
|
Level 1
|
|
|
Level 2
|
|
|
Level 3
|
|
|
Total
|
|
Assets
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Cash
|
|
$
|
14,034
|
|
|
$
|
—
|
|
|
$
|
—
|
|
|
$
|
14,034
|
|
Money market securities (cash equivalents)
|
|
|
20,276
|
|
|
|
—
|
|
|
|
—
|
|
|
|
20,276
|
|
Restricted cash (Note 12)
|
|
|
272
|
|
|
|
—
|
|
|
|
—
|
|
|
|
272
|
|
Corporate bonds and commercial paper
|
|
|
—
|
|
|
|
20,876
|
|
|
|
—
|
|
|
|
20,876
|
|
Total assets
|
|
$
|
34,582
|
|
|
$
|
20,876
|
|
|
$
|
—
|
|
|
$
|
55,458
|
|
Liabilities
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Warrants
|
|
$
|
—
|
|
|
$
|
—
|
|
|
$
|
1,105
|
|
|
$
|
1,105
|
|
|
Summary of Cash and Cash Equivalents and Short Term Investments |
Cash and cash equivalents and short term investments (in thousands):
|
|
|
|
|
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Gross
|
|
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Gross
|
|
|
|
|
|
|
|
Amortized
|
|
|
Unrealized
|
|
|
Unrealized
|
|
|
Estimated
|
|
December 31, 2016
|
|
Cost
|
|
|
Gains
|
|
|
Losses
|
|
|
Fair Value
|
|
Cash
|
|
$
|
1,800
|
|
|
$
|
—
|
|
|
$
|
—
|
|
|
$
|
1,800
|
|
Money market securities
|
|
|
11,931
|
|
|
|
—
|
|
|
|
—
|
|
|
|
11,931
|
|
Corporate bonds and commercial paper
|
|
|
1,502
|
|
|
|
—
|
|
|
|
—
|
|
|
|
1,502
|
|
Total cash and cash equivalents
|
|
$
|
15,233
|
|
|
$
|
—
|
|
|
$
|
—
|
|
|
$
|
15,233
|
|
Money market securities (restricted cash)
|
|
|
272
|
|
|
|
—
|
|
|
|
—
|
|
|
|
272
|
|
Total restricted cash
|
|
$
|
272
|
|
|
$
|
—
|
|
|
$
|
—
|
|
|
$
|
272
|
|
Corporate bonds and commercial paper
|
|
|
8,231
|
|
|
|
—
|
|
|
|
(1
|
)
|
|
|
8,230
|
|
Government securities
|
|
|
2,000
|
|
|
|
—
|
|
|
|
—
|
|
|
|
2,000
|
|
Total short-term investments
|
|
$
|
10,231
|
|
|
$
|
—
|
|
|
$
|
(1
|
)
|
|
$
|
10,230
|
|
|
|
|
|
|
|
Gross
|
|
|
Gross
|
|
|
|
|
|
|
|
Amortized
|
|
|
Unrealized
|
|
|
Unrealized
|
|
|
Estimated
|
|
December 31, 2015
|
|
Cost
|
|
|
Gains
|
|
|
Losses
|
|
|
Fair Value
|
|
Cash
|
|
$
|
14,034
|
|
|
$
|
—
|
|
|
$
|
—
|
|
|
$
|
14,034
|
|
Money market securities
|
|
|
20,276
|
|
|
|
—
|
|
|
|
—
|
|
|
|
20,276
|
|
Total cash and cash equivalents
|
|
$
|
34,310
|
|
|
$
|
—
|
|
|
$
|
—
|
|
|
$
|
34,310
|
|
Money market securities (restricted cash)
|
|
|
272
|
|
|
|
—
|
|
|
|
—
|
|
|
|
272
|
|
Total restricted cash
|
|
$
|
272
|
|
|
$
|
—
|
|
|
$
|
—
|
|
|
$
|
272
|
|
Corporate bonds and commercial paper
|
|
|
20,885
|
|
|
|
—
|
|
|
|
(9
|
)
|
|
|
20,876
|
|
Total short-term investments
|
|
$
|
20,885
|
|
|
$
|
—
|
|
|
$
|
(9
|
)
|
|
$
|
20,876
|
|
|