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Fair Value Measurements
6 Months Ended
Jun. 30, 2020
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. A three-level valuation hierarchy has been established under GAAP for disclosure of fair value measurements. The valuation hierarchy is based on the transparency of inputs to the valuation of an asset or liability as of the measurement date. The three levels are defined as follows:
Level 1:Observable inputs such as quoted prices in active markets;
Level 2:Inputs, other than the quoted prices in active markets, that are observable either directly or indirectly; and
Level 3:Unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions.
Our financial instruments consist primarily of cash and cash equivalents, marketable securities, other current assets, accounts payable and accrued liabilities, contingent consideration liabilities and our outstanding common stock warrant liabilities. Certain cash equivalents, marketable securities, contingent consideration liabilities and common stock warrant liabilities are reported at their respective fair values on our condensed consolidated balance sheets. The remaining financial instruments are carried at cost which approximates their respective fair values because of the short-term nature of these financial instruments. See Note 4 for further information regarding the amortized cost of our financial assets.
The following tables summarize assets and liabilities recognized or disclosed at fair value on a recurring basis as of June 30, 2020 and December 31, 2019 (in thousands):

June 30, 2020
Level 1Level 2Level 3Total
Assets:
Cash equivalents:
U.S. Treasuries$—  $11,300  $—  $11,300  
Money market funds61,840  —  —  61,840  
Certificate of deposits—  10,900  —  10,900  
Commercial paper—  29,143  —  29,143  
Marketable securities:
U.S. Treasuries—  55,680  —  55,680  
Commercial paper—  94,567  —  94,567  
U.S. Government-sponsored enterprises debt securities—  6,213  —  6,213  
Corporate debt securities—  54,174  —  54,174  
Certificate of deposits—  42,744  —  42,744  
Total assets(1)
$61,840  $304,721  $—  $366,561  
Liabilities:
Common stock warrant liabilities$—  $—  $36  $36  
Contingent consideration liabilities—  —  53,100  53,100  
Total liabilities$—  $—  $53,136  $53,136  
December 31, 2019
Level 1Level 2Level 3Total
Assets:
Cash equivalents:
Money market funds$11,527  $—  $—  $11,527  
Commercial paper—  7,485  —  $7,485  
Marketable securities:
Commercial paper—  73,366  —  73,366  
Corporate debt securities—  74,417  —  74,417  
Certificate of deposits—  41,302  —  41,302  
Total assets(1)
$11,527  $196,570  $—  $208,097  
Liabilities:
Common stock warrant liabilities$—  $—  $198  $198  
Contingent consideration liabilities—  —  63,800  63,800  
Total liabilities$—  $—  $63,998  $63,998  
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(1)Fair value is determined by taking into consideration valuations obtained from third-party pricing services. The third-party pricing services utilize industry standard valuation models, for which all significant inputs are observable, either directly or indirectly, to estimate fair value. These inputs include reported trades of and broker/dealer quotes on the same or similar securities; issuer credit spreads; benchmark securities; and other observable inputs.
Contingent Consideration Liability
Pursuant to the terms of the Brabant purchase agreement in 2014 in which we acquired worldwide development and commercialization rights to Fintepla, we are obligated to make future milestone payments that are contingent upon the successful achievement of certain regulatory and sales-based milestone events related to Fintepla. As of June 30, 2020, the potential amount of future payments that we may be required to make is between zero, if none of the remaining milestones are achieved, to a maximum of $60.0 million.
The following table provides a reconciliation of our contingent consideration liability measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three and six months ended June 30, 2020 and 2019 (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
2020201920202019
Balance at beginning of period$55,900  $71,200  $63,800  $78,200  
Change in fair value12,200  (700) 4,300  2,300  
Transfers out of Level 3 fair value hierarchy(1)
(15,000) —  (15,000) —  
Settlements—  —  —  (10,000) 
Balance at end of period$53,100  $70,500  $53,100  $70,500  
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(1)For the three and six months ended June 30, 2020, a $15.0 million regulatory milestone payment associated with the FDA’s approval of Fintepla was achieved and such consideration payable was no longer contingent. As of June 30, 2020, the amount has been reclassified from contingent consideration liability to accrued and other current liabilities which was subsequently paid in July 2020.
For the three months ended June 30, 2020, the $12.2 million increase to the estimated fair value of our contingent consideration liability consisted of updated assumptions used regarding the probability of success for achieving certain regulatory and sales-based milestone events in light of FDA approval of Fintepla in June 2020, which accounted for approximately $10.0 million of the increase, with the remaining increase attributed to a market-driven decrease in discount rates. The change in fair value for the three and six months ended June 30, 2019 and the six months ended June 30, 2020 was attributable to immaterial adjustments to certain assumptions and estimates used in the remeasurement to fair value.
The following table summarizes the significant unobservable inputs used in the fair value measurement of our contingent consideration liabilities as of June 30, 2020.
Fair Value
as of
June 30, 2020
(in thousands)
Valuation TechniqueUnobservable InputRange
Weighted
Average(1)
$53,100Discounted cash flowDiscount rate
4.5% — 12.7%
6.8%
Probability of payment
0% — 94.3%
94.3%
Projected year of payment2021 — 20302022
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(1)Unobservable inputs were weighted by the relative fair value of the contingent consideration liability. For projected year of payment, the amount represents the median of the inputs and is not a weighted average.
The weighted average discount rate was calculated based on the relative fair value of our contingent consideration obligations. Significant increases or decreases in projected revenues, probabilities of payment, discount rates or the time until payment is made would have resulted in a significantly lower or higher fair value measurement as of June 30, 2020.