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Fair Value Measurements | 9 Months Ended
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Sep. 30, 2017
Fair Value Disclosures [Abstract] |
Fair Value Measurements | Fair Value Measurements 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.
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%
We received a $0.2 million repayment on the Viking note in Q3 2017. There was no other significant change in estimated fair value of the Viking note receivable and contingent consideration during the nine months ended September 30, 2017. Other Fair Value Measurements 2019 Convertible Senior Notes In August 2014, the Company issued $245.0 million aggregate principal amount of its 2019 Convertible Senior Notes. The Company uses a quoted rate in a market that is not active, which is classified as a Level 2 input, to estimate the current fair value of its 2019 Convertible Senior Notes. The estimated fair value of the 2019 Senior Convertible Notes was $447.0 million as of September 30, 2017. The carrying value of the notes does not reflect the market rate. Additionally, at the time of the convertible notes issuance, the Company entered into convertible bond hedges, which is not required to be measured or disclosed at fair value, to offset the impact of potential dilution to the Company's common stock upon the conversion of the notes. See Note 3 Convertible Senior Notes for additional information about the convertible notes and the bond hedges. Viking The Company records its investment in Viking under the equity method of accounting. See Note 1 Significant Accounting Policies for the fair value of the Company's equity investment in Viking.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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