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Assets and Liabilities Measured at Fair Value | 12 Months Ended
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Dec. 31, 2016
Assets and Liabilities Measured at Fair Value |
Assets and Liabilities Measured at Fair Value | 10. Assets and Liabilities Measured at Fair Value The Company's financial assets and liabilities are measured at fair value and classified within the fair value hierarchy which is defined as follows: Level 1 — Quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date. Level 2 — Inputs other than quoted prices in active markets that are observable for the asset or liability, either directly or indirectly. Level 3 — Inputs that are unobservable for the asset or liability. A summary of the fair value of the Company's recurring assets and liabilities aggregated by the level in the fair value hierarchy within which those measurements fall as of December 31, 2016 are identified in the following table (in thousands):
|  | Level 2 |  | Total |
Commercial paper |  | $ | 68,390 |  | $ | 68,390 |
Corporate debt securities |  |  | 74,535 |  |  | 74,535 |
Money market funds |  |  | 1,829 |  |  | 1,829 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | $ | 144,754 |  | $ | 144,754 |
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|  | Level 2 |  | Level 3 |  | Total |
Liabilities: |  |  |  |  |  |  |  |  |  |
Contingent consideration payable |  | $ | — |  | $ | 269,722 |  | $ | 269,722 |
Derivative liability |  |  | 265 |  |  | — |  |  | 265 |
Deferred compensation plan liability |  |  | 1,479 |  |  | — |  |  | 1,479 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | $ | 1,744 |  | $ | 269,722 |  | $ | 271,466 |
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A summary of the fair value of the Company's assets and liabilities aggregated by the level in the fair value hierarchy within which those measurements fall as of December 31, 2015 are identified in the following table (in thousands):
|  | Level 2 |  | Total |
Commercial paper |  |  | 25,724 |  |  | 25,724 |
Corporate debt securities |  |  | 118,474 |  |  | 118,474 |
Certificate of deposit |  |  | 350 |  |  | 350 |
Market exchanged mutual funds |  |  | 658 |  |  | 658 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | $ | 145,206 |  | $ | 145,206 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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|  | Level 2 |  | Level 3 |  | Total |
Liabilities: |  |  |  |  |  |  |  |  |  |
Contingent consideration payable |  | $ | — |  | $ | 274,077 |  | $ | 274,077 |
Deferred compensation plan liability |  |  | 667 |  |  | — |  |  | 667 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | $ | 667 |  | $ | 274,077 |  | $ | 274,744 |
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See "— Note 16. Debt Instruments and Related Party Transactions" for the carrying amount and estimated fair value of the Company's Convertible Notes due in 2023. The Company did not have any Level 3 assets as of December 31, 2016 or 2015. Cash, Money Market Funds and Marketable Securities The Company classifies its cash and money market funds within the fair value hierarchy as Level 1 as these assets are valued using quoted prices in active market for identical assets at the measurement date. The Company considers its investments in marketable securities as available for sale and classifies these assets within the fair value hierarchy as Level 2 primarily utilizing broker quotes in a non-active market for valuation of these securities. No changes in valuation techniques or inputs occurred during the year ended December 31, 2016. No transfers of assets between Level 1 and Level 2 of the fair value measurement hierarchy occurred during the year ended December 31, 2016. Contingent Consideration Payable The contingent consideration payable resulted from the acquisitions of Scioderm and Callidus, as discussed in "— Note 3. Acquisitions." The most recent valuation was determined using a probability weighted discounted cash flow valuation approach. Using this approach, expected future cash flows are calculated over the expected life of the agreement, are discounted, and then exercise scenario probabilities are applied. The valuation is performed quarterly. Gains and losses are included in the statement of operations. As discussed in "— Note 3. Acquisitions," on July 5, 2016, the Company entered into the MiaMed Agreement with MiaMed. MiaMed is a pre-clinical biotechnology company focused on developing protein replacement for CDKL5 and related diseases. Under the terms of the MiaMed Agreement, the Company agreed to pay up to an additional $83.0 million in connection with the achievement of certain clinical, regulatory and commercial milestones, for a potential aggregate deal value of $89.5 million. The MiaMed Agreement was accounted for as an asset acquisition and as such the Company determined that a liability for future milestone payments is not required to be recorded until the actual contingencies are met and will be recorded to research and development expenses when the contingency is resolved. The contingent consideration payable for Scioderm and Callidus has been classified as a Level 3 recurring liability as its valuation requires substantial judgment and estimation of factors that are not currently observable in the market. If different assumptions were used for the various inputs to the valuation approach the estimated fair value could be significantly higher or lower than the fair value the Company determined. The Company may be required to record losses in future periods, including expenses related to CDKL5. The following significant unobservable inputs were used in the valuation of the contingent consideration payable to former Scioderm stockholders:
Contingent Consideration Liability |  | Fair value as of December 31, 2016 |  | Valuation Technique |  | Unobservable Input |  | Range
|  |  |  |  |  | Discount rate |  | 0.62% - 3.8%
Clinical and regulatory milestones |  | $237.2 million |  | Probability weighted discounted cash flow |  | Probability of achievement of milestones |  | 66.5% - 100.0%
|  |  |  |  |  | Projected year of payments |  | 2017-2019
|  |  |  |  |  | Revenue volatility |  | 58%
|  |  |  |  |  | Probability of achievement of milestones |  | 66.5%
Revenue-based milestones |  | $22.8 million |  | Monte Carlo |  | Discount rate |  | 1.47% - 2.55%
|  |  |  |  |  | Projected year of payments |  | 2019-2029
The following significant unobservable inputs were used in the valuation of the contingent consideration payable of Callidus for the ATB-200 Pompe program:
Contingent Consideration Liability |  | Fair value as of December 31, 2016 |  | Valuation Technique |  | Unobservable Input |  | Range
|  |  |  |  |  | Discount rate |  | 12.5%
Clinical and regulatory milestones |  | $9.3 million |  | Probability weighted discounted cash flow |  | Probability of achievement of milestones |  | 30.4%-42.8%
|  |  |  |  |  | Projected year of payments |  | 2018-2022
Contingent consideration liabilities are remeasured to fair value each reporting period using projected revenues, discount rates, probabilities of payment and projected payment dates. Projected contingent payment amounts related to clinical and regulatory based milestones are discounted back to the current period using a discounted cash flow model. Revenue-based payments are valued using a monte-carlo valuation model, which simulates future revenues during the earn out-period using management's best estimates. Projected revenues are based on our most recent internal operational budgets and long-range strategic plans. Increases in projected revenues and probabilities of payment may result in higher fair value measurements. Increases in discount rates and the time to payment may result in lower fair value measurements. Increases or decreases in any of those inputs together, or in isolation, may result in a significantly lower or higher fair value measurement. There is no assurance that any of the conditions for the milestone payments will be met. The following table shows the change in the balance of contingent consideration payable for the year ended December 31, 2016 and 2015, respectively (in thousands):
|  | Year ended December 31, |
|  | 2016 |  | 2015 |
Balance, beginning of the period |  | $ | 274,077 |  | $ | 10,700 |
Additions, from business acquisitions |  |  | — |  |  | 259,000 |
Payment of contingent consideration in cash |  |  | (5,000 | ) |  | — |
Payment of contingent consideration in stock |  |  | (6,115 | ) |  | — |
Unrealized change in fair value change during the period, included in Statement of Operations |  |  | 6,760 |  |  | 4,377 |
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Balance, end of the period |  | $ | 269,722 |  | $ | 274,077 |
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Deferred Compensation Plan- Investment and Liability As disclosed in "— Note 9. Stockholders' Equity," the Deferral Plan provides certain key employees and members of the Board of Directors with an opportunity to defer the receipt of such participant's base salary, bonus and director's fees, as applicable. Deferral Plan assets are classified as trading securities and recorded at fair value with changes in the investments' fair value recognized in the period they occur. The asset investments consist of market exchanged mutual funds. The Company considers its investments in marketable securities, as available-for-sale and classifies these assets and related liability within the fair value hierarchy as Level 2 primarily utilizing broker quotes in a non-active market for valuation of these securities. Foreign Currency Exchange Rate Exposure The Company transacts business in various foreign countries and therefore, is subject to risk of foreign currency exchange rate fluctuations. As such, in June 2016, the Company entered into a forward contract to economically hedge transactional exposure associated with commitments arising from trade accounts payable denominated in a currency other than the functional currency of the respective operating entity. The Company did not designate this forward contract as a hedging instrument under applicable accounting guidance and, therefore, the change in fair value is recorded in the Consolidated Statements of Operations. The forward contract settles in monthly installments with the final installment settlement in June 2017. There were no outstanding forward contracts at December 31, 2015. For the year ended December 31, 2016, the Company recognized a loss of $265 thousand, related to the derivative instruments not designated as hedging instruments in the Consolidated Statements of Operations and the corresponding liability of $265 thousand is recorded as other current liability in the Consolidated Balance Sheets. The impact of gains and losses on foreign exchange contracts not designated as hedging instruments related to changes in the fair value of assets and liabilities denominated in foreign currencies are generally offset by net foreign exchange gains and losses, which are also included on the Consolidated Statements of Operations in other income (expense), net for all periods presented. When the Company enters into foreign exchange contracts not designated as hedging instruments to mitigate the impact of exchange rate volatility in the translation of foreign earnings, gains and losses will generally be offset by fluctuations in the U.S. Dollar translated amounts of each account within the Consolidated Statements of Operations in current and/or future periods.

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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 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13504-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 + Details
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