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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2020
Fair Value Disclosures [Abstract] |
Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis and Level of Inputs used in such Measurements | The following tables show the Company’s financial assets and liabilities measured at fair value on a recurring basis and the level of inputs used in such measurements as of June 30, 2020 and December 31, 2019 (in thousands):
|  | As of June 30, 2020
|  | Adjusted Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |  |  | Fair Value Level
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 1,757 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,757 |  |  |
Money market funds |  |  | 20,285 |  |  |  | — |  |  |  | — |  |  |  | 20,285 |  |  | Level 1
Commercial paper |  |  | 3,000 |  |  |  | — |  |  |  | — |  |  |  | 3,000 |  |  | Level 2
Total cash and cash equivalents |  |  | 25,042 |  |  |  | — |  |  |  | — |  |  |  | 25,042 |  |  |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  |  | 13,828 |  |  |  | 40 |  |  |  | — |  |  |  | 13,868 |  |  | Level 2
Corporate debt securities |  |  | 3,911 |  |  |  | 15 |  |  |  | — |  |  |  | 3,926 |  |  | Level 2
U.S. agency securities |  |  | 61,326 |  |  |  | 76 |  |  |  | (6 | ) |  |  | 61,396 |  |  | Level 2
Asset-backed securities |  |  | 1,000 |  |  |  | 1 |  |  |  | — |  |  |  | 1,001 |  |  | Level 2
Total short-term investments |  |  | 80,065 |  |  |  | 132 |  |  |  | (6 | ) |  |  | 80,191 |  |  |
Total assets measured at fair value |  | $ | 105,107 |  |  | $ | 132 |  |  | $ | (6 | ) |  | $ | 105,233 |  |  |
|  | As of December 31, 2019
|  | Adjusted Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |  |  | Fair Value Level
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 1,271 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,271 |  |  |
Money market funds |  |  | 12,495 |  |  |  | — |  |  |  | — |  |  |  | 12,495 |  |  | Level 1
Commercial paper |  |  | 41,281 |  |  |  | — |  |  |  | (1 | ) |  |  | 41,280 |  |  | Level 2
Total cash and cash equivalents |  |  | 55,047 |  |  |  | — |  |  |  | (1 | ) |  |  | 55,046 |  |  |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  |  | 17,898 |  |  |  | — |  |  |  | (6 | ) |  |  | 17,892 |  |  | Level 2
U.S. government securities |  |  | 4,011 |  |  |  | — |  |  |  | — |  |  |  | 4,011 |  |  | Level 2
Corporate debt securities |  |  | 13,953 |  |  |  | 1 |  |  |  | (6 | ) |  |  | 13,948 |  |  | Level 2
U.S. agency securities |  |  | 32,776 |  |  |  | 20 |  |  |  | (2 | ) |  |  | 32,794 |  |  | Level 2
Asset-backed securities |  |  | 4,598 |  |  |  | — |  |  |  | — |  |  |  | 4,598 |  |  | Level 2
Total short-term investments |  |  | 73,236 |  |  |  | 21 |  |  |  | (14 | ) |  |  | 73,243 |  |  |
Total assets measured at fair value |  | $ | 128,283 |  |  | $ | 21 |  |  | $ | (15 | ) |  | $ | 128,289 |  |  |
Schedule of Risk-free Interest Rate Based on U.S. Treasury Yield Curve Over Expected Term of Warrants | The risk-free interest rate was based on the U.S. Treasury yield curve over the expected term of the warrants.
|  | Period Ended
|  | June 24, 2019
Expected term (in years) |  | 5.01 - 5.26
Volatility |  | 57.20% - 57.24%
Risk-free interest rate |  | 1.75%
Dividend yield |  | –%
Summary of Changes in Fair Value of Level 3 Financial Instruments | The following table sets forth a summary of the changes in the fair value of the Company’s Level 3 financial instruments (in thousands):
|  | Warrant Liability |
Balance — December 31, 2018 |  | $ | 683 |
Change in fair value |  |  | 1,403 |
Reclassification of warrant liability to additional paid-in capital on conversion |  |  | (2,086 | )
Balance — June 30, 2019 |  | $ | — |

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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