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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2017
Fair Value Disclosures [Abstract] |
Summary of the assets and liabilities measured at fair value on recurring basis | The following table presents the Company's hierarchy for assets and liabilities measured at fair value.
|  | September 30, 2017 |  | December 31, 2016
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term investments(1) |  | $ | 2,753 |  |  | $ | 166,767 |  |  | $ | — |  |  | $ | 169,520 |  |  | $ | 3,054 |  |  | $ | 119,242 |  |  | $ | — |  |  | $ | 122,296 |
Note receivable Viking (2) |  | — |  |  | — |  |  | 3,007 |  |  | 3,007 |  |  | — |  |  | — |  |  | 3,207 |  |  | 3,207 |
Investment in warrants (3) |  | 1,110 |  |  | — |  |  | — |  |  | 1,110 |  |  | 684 |  |  | — |  |  | — |  |  | 684 |
Total assets |  | $ | 3,863 |  |  | $ | 166,767 |  |  | $ | 3,007 |  |  | $ | 173,637 |  |  | $ | 3,738 |  |  | $ | 119,242 |  |  | $ | 3,207 |  |  | $ | 126,187 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current contingent liabilities-CyDex (4) |  | $ | — |  |  | $ | — |  |  | $ | 86 |  |  | $ | 86 |  |  | $ | — |  |  | $ | — |  |  | $ | 101 |  |  | $ | 101 |
Long-term contingent liabilities-CyDex (4) |  | — |  |  | — |  |  | 1,503 |  |  | 1,503 |  |  | — |  |  | — |  |  | 1,503 |  |  | 1,503 |
Long-term contingent liabilities-Metabasis (5) |  | — |  |  | 3,693 |  |  | — |  |  | 3,693 |  |  | — |  |  | 1,413 |  |  | — |  |  | 1,413 |
Liability for amounts owed to former licensees(6) |  | 413 |  |  | — |  |  | — |  |  | 413 |  |  | 371 |  |  | — |  |  | — |  |  | 371 |
Total liabilities |  | $ | 413 |  |  | $ | 3,693 |  |  | $ | 1,589 |  |  | $ | 5,695 |  |  | $ | 371 |  |  | $ | 1,413 |  |  | $ | 1,604 |  |  | $ | 3,388 |
(1) | Investments in equity securities, which the Company received as a result of event-based and upfront payments from licensees, are classified as level 1 as the fair value is determined using quoted market prices in active markets for the same securities. Short-term investments in marketable securities with maturities greater than 90 days are classified as level 2 of the fair value hierarchy, as these investment securities are valued based upon quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market.
(2) | The fair value of the convertible note receivable from Viking was determined using a probability weighted option pricing model using a lattice methodology. The fair value is subjective and is affected by certain significant input to the valuation model such as the estimated volatility of the common stock, which was estimated to be 75% at September 30, 2017. Changes in these assumptions may materially affect the fair value estimate.
(3) | Investment in warrants, which the Company received as a result of Viking’s partial repayment of the Viking note receivable and the Company’s purchase of Viking common stock and warrants in April 2016, are classified as level 1 as the fair value is determined using quoted market prices in active markets for the same securities. The change of the fair value is recorded in the other income or expenses in the Company's condensed consolidated statement of operations.
(4) | The fair value of the liabilities for CyDex contingent liabilities were determined based on the income approach. To the extent the estimated future income may vary significantly given the long-term nature of the estimate, the Company utilizes a Monte Carlo model. The fair value is subjective and is affected by changes in inputs to the valuation model including management’s estimates of timing and probability of achievement of certain revenue thresholds and developmental and regulatory milestones which may be achieved and affect amounts owed to former license holders. Changes in these assumptions can materially affect the fair value estimate.
(5) | The liability for CVRs for Metabasis are determined using quoted prices in a market that is not active for the underlying CVR.
(6) | The liability for amounts owed to former licensees are determined using quoted market prices in active markets for the underlying investment received from a partner, a portion of which is owed to former licensees.
Summary of CyDex acquisition | The following table represents significant unobservable inputs used in determining the fair value of contingent liabilities assumed in the acquisition of CyDex:
| September 30, 2017 |  | December 31, 2016
Revenue volatility | 25% |  | 25%
Average probability of commercialization | 12.5% |  | 12.5%
Market price of risk | 0.03 |  | 0.03
Credit rating | BB |  | BB
Equity risk premium | 6% |  | 6%

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=66048111&loc=SL7498348-110258 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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- Definition Tabular disclosure of quantitative information about the inputs used in the fair value measurement of liabilities. This disclosure may include, but is not limited to, the fair value of the liability, valuation technique used to measure fair value, the inputs used to measure fair value, the ranges of the inputs, and the weighted averages of the inputs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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