Fair Value Measurements (Tables)
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3 Months Ended |
12 Months Ended |
Mar. 31, 2017 |
Dec. 31, 2016 |
Fair Value Disclosures [Abstract] |
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|
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):
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March 31, 2017
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|
Level 1 |
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|
Level 2 |
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|
Level 3 |
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|
Total |
|
Assets
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Cash
|
|
$ |
2,728 |
|
|
$ |
— |
|
|
$ |
— |
|
|
$ |
2,728 |
|
Money market securities (cash equivalents)
|
|
|
12,962 |
|
|
|
— |
|
|
|
— |
|
|
|
12,962 |
|
Restricted cash (Note 7)
|
|
|
272 |
|
|
|
— |
|
|
|
— |
|
|
|
272 |
|
Corporate bonds and commercial paper (short term investments)
|
|
|
— |
|
|
|
760 |
|
|
|
— |
|
|
|
760 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Total assets
|
|
$ |
15,962 |
|
|
$ |
760 |
|
|
$ |
—
|
|
|
$ |
16,722 |
|
Liabilities
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Warrants
|
|
$ |
— |
|
|
$ |
— |
|
|
$ |
180 |
|
|
$ |
180 |
|
|
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):
|
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|
|
|
|
|
|
|
|
|
|
|
|
|
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|
December 31, 2016
|
|
Level 1 |
|
|
Level 2 |
|
|
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 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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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 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 three months ended
March 31, 2017. During the three months ended March 31,
2017, we did not issue any common stock warrants that were
classified as liabilities (in thousands):
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|
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|
|
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|
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Liability at
December 31,
2016 |
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|
Issuance of
Warrants |
|
|
Unrealized
Gain on
warrants |
|
|
Liability at
March 31,
2017 |
|
Warrant liability
|
|
$ |
232 |
|
|
$ |
— |
|
|
$ |
(52 |
) |
|
$ |
180 |
|
|
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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|
|
|
|
|
|
|
|
|
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|
|
|
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Liability at
December 31,
2015 |
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|
Issuance of
Warrants |
|
|
Unrealized
Gain on
warrants |
|
|
Liability at
December 31,
2016 |
|
Warrant liability
|
|
$ |
1,105 |
|
|
$ |
— |
|
|
$ |
(873 |
) |
|
$ |
232 |
|
|
Summary of Cash and Cash Equivalents and Short Term Investments |
Cash, cash equivalents and short-term investments consist of the
following (in thousands):
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March 31, 2017
|
|
Amortized
Cost |
|
|
Gross
Unrealized
Gains |
|
|
Gross
Unrealized
Losses |
|
|
Estimated
Fair
Value
|
|
Cash
|
|
$ |
2,728 |
|
|
$ |
— |
|
|
$ |
— |
|
|
$ |
2,728 |
|
Money market securities
|
|
|
12,962 |
|
|
|
— |
|
|
|
— |
|
|
|
12,962 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Total cash and cash equivalents
|
|
$ |
15,690 |
|
|
$ |
—
|
|
|
$ |
—
|
|
|
$ |
15,690 |
|
Money market securities (restricted cash)
|
|
|
272 |
|
|
|
— |
|
|
|
— |
|
|
|
272 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Total restricted cash
|
|
$ |
272 |
|
|
$ |
—
|
|
|
$ |
—
|
|
|
$ |
272 |
|
Corporate bonds and commercial paper
|
|
$ |
760 |
|
|
|
— |
|
|
|
— |
|
|
$ |
760 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Total short-term investments
|
|
$ |
760 |
|
|
$ |
—
|
|
|
$ |
—
|
|
|
$ |
760 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Cash and cash equivalents and short term investments (in
thousands):
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
December 31, 2016
|
|
Amortized
Cost |
|
|
Gross
Unrealized
Gains |
|
|
Gross
Unrealized
Losses |
|
|
Estimated
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 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
December 31, 2015
|
|
Amortized
Cost |
|
|
Gross
Unrealized
Gains |
|
|
Gross
Unrealized
Losses |
|
|
Estimated
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 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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|