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Fair Value Measurements | 6 Months Ended
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Jun. 30, 2020
Fair Value Disclosures [Abstract] |
Fair Value Measurements | Fair Value Measurements ASC Topic 820, Fair Value Measurement, establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value, as follows: Level 1 Inputs - unadjusted quoted prices in active markets for identical assets or liabilities accessible to the reporting entity at the measurement date; Level 2 Inputs - other than quoted prices included in Level 1 inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the asset or liability; and Level 3 Inputs - unobservable inputs for the asset or liability used to measure fair value to the extent that observable inputs are not available, thereby allowing for situations in which there is little, if any, market activity for the asset or liability at measurement date. Assets and liabilities measured at fair value on a recurring basis as of June 30, 2020 are as follows:
| Total |  | Level 1 |  | Level 2 |  | Level 3
Assets |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 7,602 |  |  | $ | 7,602 |  |  | $ | — |  |  | $ | — |
Short-term investments: |  |  |  |  |  |  |
Commercial paper | 15,188 |  |  | — |  |  | 15,188 |  |  | — |
Corporate notes/bonds | 45,065 |  |  | — |  |  | 45,065 |  |  | — |
U.S. Treasuries | 2,275 |  |  | — |  |  | 2,275 |  |  | — |
U.S. government agency securities | 6,051 |  |  | — |  |  | 6,051 |  |  | — |
Total financial assets | $ | 76,181 |  |  | $ | 7,602 |  |  | $ | 68,579 |  |  | $ | — |
Liabilities |  |  |  |  |  |  |
Common stock warrant liability | $ | 257 |  |  | $ | — |  |  | $ | — |  |  | $ | 257 |
Total financial liabilities | $ | 257 |  |  | $ | — |  |  | $ | — |  |  | $ | 257 |
Assets and liabilities measured at fair value on a recurring basis as of December 31, 2019 are as follows:
| Total |  | Level 1 |  | Level 2 |  | Level 3
Assets |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 31,078 |  |  | $ | 31,078 |  |  | $ | — |  |  | $ | — |
Commercial paper | 2,498 |  |  | — |  |  | 2,498 |  |  | — |
Short-term investments: |  |  |  |  |  |  |
Commercial paper | 11,433 |  |  | — |  |  | 11,433 |  |  | — |
Corporate notes/bonds | 36,597 |  |  | — |  |  | 36,597 |  |  | — |
U.S. Treasuries | 4,512 |  |  | — |  |  | 4,512 |  |  | — |
U.S. government agency securities | 9,784 |  |  | — |  |  | 9,784 |  |  | — |
Total financial assets | $ | 95,902 |  |  | $ | 31,078 |  |  | $ | 64,824 |  |  | $ | — |
Liabilities |  |  |  |  |  |  |
Common stock warrant liability | $ | 414 |  |  | $ | — |  |  | $ | — |  |  | $ | 414 |
Total financial liabilities | $ | 414 |  |  | $ | — |  |  | $ | — |  |  | $ | 414 |
The Company uses the market approach and Level 1 and Level 2 inputs to value its cash equivalents and Level 2 inputs to value its short-term investments. The Company’s common stock warrant liability (refer to Note 8, Stockholders’ Equity, for more information) is classified within Level 3 of the fair value hierarchy. The fair value of the common stock warrant liability was determined using the Black-Scholes option-pricing model. The fair value of the common stock warrant liability is based significantly on the fair value of the Company’s common stock. At the date of issuance, the common stock warrant liability was determined using the following weighted-average assumptions: expected term of 2.0 years, risk-free interest rate of 1.53%, expected volatility of 78.97%, and no expected dividends. The following weighted-average assumptions were used to estimate the fair value of the common stock warrant liability at June 30, 2020:
| June 30, 2020
Expected term | 0.8 years
Risk-free interest rate | 0.2 | %
Expected volatility | 93.09 | %
Expected dividend yield | — | %
A 10% change in the estimate of expected volatility at June 30, 2020 would increase or decrease the fair value of the common stock warrant liability in the amount of $33. A 10% change in the estimate of fair value of the common stock at June 30, 2020 would increase or decrease the fair value of the common stock warrant liability in the amount of $59. The following is a reconciliation of the Company’s liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3) for the three months ended June 30, 2020:
| Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
| Common Stock Warrant Liability
Balance at December 31, 2019 | $ | 414 |
Additions |
Gain included in other income (expense), net | (157) |
Balance at June 30, 2020 | $ | 257 |

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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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