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Fair Value of Financial Instruments | 12 Months Ended
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Dec. 31, 2019
Fair Value Disclosures [Abstract] |
Fair Value of Financial Instruments | 9. Fair Value of Financial Instruments The availability of observable inputs can vary among the various types of financial assets and liabilities. To the extent that the valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, for financial statement disclosure purposes, the level in the fair value hierarchy within which the fair value measurement is categorized is based on the lowest level input that is significant to the overall fair value measurement. The Company uses the exit price method for estimating the fair value of loans for disclosure purposes. The carrying amounts reported in the accompanying consolidated financial statements for cash, accounts receivable, accounts payable, and accrued expenses and other current liabilities (excluding the Milestone Rights liability) approximate their fair value due to their relatively short maturities. The fair value of the cash equivalents, MidCap Credit Facility, Mann Group promissory notes, 2024 convertible notes, 2020 notes, and Milestone Rights liabilities are disclosed below. Cash Equivalents and Restricted Cash — Cash equivalents consist of highly liquid investments with original or remaining maturities of 90 days or less at the time of purchase that are readily convertible into cash. As of December 31, 2019 and 2018, the Company held $29.9 million and $71.2 million, respectively, of cash and cash equivalents. The Company held $0.3 million and $0.5 million in restricted cash as of December 31, 2019 and 2018, respectively. Both are comprised of money market funds. Restricted cash is used to collateralize a letter of credit. The fair value of these money market funds was determined by using quoted prices for identical investments in an active market (Level 1 in the fair value hierarchy). Short-term investments— Short-term investments consist of highly liquid investments that are intended to facilitate liquidity and capital preservation. As of December 31, 2019, the Company held $20.0 million of short-term investments in U.S. Treasury bills or notes. The Company did not have short-term investments as of December 31, 2018. The fair value of short-term investments approximate their carrying value. The fair value measurement is based on a market approach using quoted market values (Level 1 in the fair value hierarchy). The fair value measurement of debt instruments is based on a discounted cash flow model and is sensitive to the change in yield (Level 3 in the fair value hierarchy):
|  |  |  |  |  | Hypothetical Change in Yield |  |  |  |  |  |  | Hypothetical Change in Notes Payable |
|  | Yield |  |  | % Change |  |  | Hypothetical Yield |  |  | FV of Notes |  |  | FV |  |  | $ Change |  |  | % Change |
|  |  |  |  |  |  |  |  |  |  |  |  |  | (in millions) |  |  |  |  |
Mann Group promissory notes: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(with conversion feature) |  |  | 29.0 | % |  |  | 2 | % |  |  | 31.0 | % |  | $ | 46.2 |  |  | $ | 44.1 |  |  | $ | (2.1 | ) |  |  | -4.5 | %
|  |  | 29.0 | % |  |  | -2 | % |  |  | 27.0 | % |  | $ | 46.2 |  |  | $ | 48.5 |  |  | $ | 2.3 |  |  |  | 5.0 | %
|  |  | 29.0 | % |  |  | 4 | % |  |  | 33.0 | % |  | $ | 46.2 |  |  | $ | 42.2 |  |  | $ | (4.0 | ) |  |  | -8.7 | %
|  |  | 29.0 | % |  |  | -4 | % |  |  | 25.0 | % |  | $ | 46.2 |  |  | $ | 51.0 |  |  | $ | 4.8 |  |  |  | 10.4 | %
Senior notes: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(with conversion feature) |  |  | 29.0 | % |  |  | 2 | % |  |  | 31.0 | % |  | $ | 8.0 |  |  | $ | 7.8 |  |  | $ | (0.2 | ) |  |  | -2.5 | %
|  |  | 29.0 | % |  |  | -2 | % |  |  | 27.0 | % |  | $ | 8.0 |  |  | $ | 8.2 |  |  | $ | 0.2 |  |  |  | 2.5 | %
|  |  | 29.0 | % |  |  | 4 | % |  |  | 33.0 | % |  | $ | 8.0 |  |  | $ | 7.6 |  |  | $ | (0.4 | ) |  |  | -5.0 | %
|  |  | 29.0 | % |  |  | -4 | % |  |  | 25.0 | % |  | $ | 8.0 |  |  | $ | 8.4 |  |  | $ | 0.4 |  |  |  | 5.0 | %
MidCap Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  | 11.5 | % |  |  | 1 | % |  |  | 12.5 | % |  | $ | 40.0 |  |  | $ | 39.0 |  |  | $ | (1.0 | ) |  |  | -2.5 | %
|  |  | 11.5 | % |  |  | -1 | % |  |  | 10.5 | % |  | $ | 40.0 |  |  | $ | 41.0 |  |  | $ | 1.0 |  |  |  | 2.5 | %
|  |  | 11.5 | % |  |  | 2 | % |  |  | 13.5 | % |  | $ | 40.0 |  |  | $ | 38.1 |  |  | $ | (1.9 | ) |  |  | -4.8 | %
|  |  | 11.5 | % |  |  | -2 | % |  |  | 9.5 | % |  | $ | 40.0 |  |  | $ | 42.1 |  |  | $ | 2.1 |  |  |  | 5.3 | %
Financial Liabilities — The following tables set forth the fair value of the Company’s financial instruments as of December 31, 2019 and 2018 (in millions):
|  | December 31, 2019 |
|  |  |  |  |  | Fair Value |
|  | Carrying Amount |  |  | Significant Unobservable Inputs (Level 3) |  |  | Total Fair Value |
Financial liabilities: |  |  |  |  |  |  |  |  |  |  |  |
MidCap Credit Facility |  | $ | 38.9 |  |  | $ | 40.0 |  |  | $ | 40.0 |
2024 convertible notes |  |  | 5.0 |  |  |  | 3.7 |  |  |  | 3.7 |
June 2020 note |  |  | 2.5 |  |  |  | 2.3 |  |  |  | 2.3 |
December 2020 note |  |  | 2.5 |  |  |  | 2.0 |  |  |  | 2.0 |
Mann Group promissory notes |  |  | 70.0 |  |  |  | 46.2 |  |  |  | 46.2 |
Milestone Rights |  |  | 7.3 |  |  |  | 16.4 |  |  |  | 16.4 |
Total financial liabilities |  | $ | 126.2 |  |  | $ | 110.6 |  |  | $ | 110.6 |
|  | December 31, 2018 |
|  |  |  |  |  | Fair Value |
|  | Carrying Value |  |  | Significant Unobservable Inputs (Level 3) |  |  | Total Fair Value |
Financial liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Deerfield Credit Facility |  | $ | 11.3 |  |  | $ | 11.4 |  |  | $ | 11.4 |
Senior convertible notes |  |  | 19.1 |  |  |  | 17.5 |  |  |  | 17.5 |
Mann Group promissory notes |  |  | 72.1 |  |  |  | 55.0 |  |  |  | 55.0 |
Milestone Rights |  |  | 8.9 |  |  |  | 18.1 |  |  |  | 18.1 |
Total financial liabilities |  | $ | 111.4 |  |  | $ | 102.0 |  |  | $ | 102.0 |
Milestone Rights Liability — The fair value measurement of the Milestone Rights liability is sensitive to the discount rate and the timing of achievement of milestones. The Company utilized Monte-Carlo Simulation Method to simulate the Net Sales under a neutral framework to estimate the payment. The Company then discounted the future expected payments at cost of debt with a term equal to the simulated time to payout based on cumulative sales. Embedded Derivatives — The Company identified and evaluated a number of embedded features in the notes issued under the Deerfield Credit Facility to determine if they represented embedded derivatives that are required to be separated from the notes and accounted for as freestanding instruments. The Company analyzed the Tranche B notes and identified embedded derivatives, which required separate accounting. All of the embedded derivatives were determined to have a de minimis value at December 31, 2018 and no value as of December 31, 2019 due to the repayment of the Deerfield Credit Facility in August 2019.

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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