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FAIR VALUE MEASUREMENTS | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
FAIR VALUE MEASUREMENTS |  |
FAIR VALUE MEASUREMENTS | 4. FAIR VALUE MEASUREMENTS Fair value accounting is applied for all financial assets and liabilities that are recognized or disclosed at fair value in the financial statements on a recurring basis. At March 31, 2021 and December 31, 2020, the carrying amount of accounts receivable, other current assets, other assets, accounts payable, and accrued and other current liabilities approximated their estimated fair value due to their relatively short maturities. The following table provides the financial instruments measured at fair value (in thousands): ​
​ | ​ | March 31, 2021 |
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total | ​
Assets | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash equivalents: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Money market fund | ​ | $ | 67 | ​ | $ | — | ​ | $ | — | ​ | $ | 67 | ​
Liabilities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Convertible preferred stock warrant liability | ​ | $ | — | ​ | $ | — | ​ | $ | 161,486 | ​ | $ | 161,486 | ​
Total liabilities | ​ | $ | — | ​ | $ | — | ​ | $ | 161,486 | ​ | $ | 161,486 | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020 |
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Assets | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash equivalents: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Money market fund | ​ | $ | 67 | ​ | $ | — | ​ | $ | — | ​ | $ | 67 | ​
Liabilities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Convertible preferred stock warrant liability | ​ | $ | — | ​ | $ | — | ​ | $ | 95,342 | ​ | $ | 95,342 | ​
Total liabilities | ​ | $ | — | ​ | $ | — | ​ | $ | 95,342 | ​ | $ | 95,342 | ​
​ The Company’s money market funds are classified as Level 1 because they are valued using quoted market prices. The convertible preferred stock warrant liabilities are defined as Level 3 in the fair value hierarchy as the valuations are based on significant unobservable inputs, which reflect the Company’s own assumptions incorporated in valuation techniques used to determine fair value; further discussion of these assumptions is set forth below. There were no transfers into or out of Level 3 of the fair value hierarchy during the periods presented. Convertible Preferred Stock Warrant Liabilities The fair value of the detachable redeemable preferred stock warrants was determined as of March 31, 2021 using the Black-Scholes method as well as a discount for lack of marketability. Black-Scholes inputs used to value the warrants are based on information from purchase agreements and within valuation reports prepared by an independent third party for the Company. Inputs include exercise price, volatility, fair value of common or preferred stock, expected dividend rate and risk-free interest rate. The key assumptions used for the valuation of the preferred stock warrant liabilities upon remeasurement were as follows: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, |
​ |  | 2021 |  | 2020 | ​
Volatility | ​ | 65.0 | % | 75.0 | %
Risk-free interest rate | ​ | 0.1 | % | 0.3 | %
Expected term (in years) | ​ | 1.2 | ​ | 2.3 | ​
Dividend yield | ​ | — | % | — | %
Discount for lack of marketability | ​ | 6.8 | % | 40.0 | %
​ The following table presents the changes in the liability for warrants on convertible preferred stock during the three months ended March 31, 2021 (in thousands): ​
​ | ​ | ​ | ​ | ​
​ |  | Convertible Preferred Warrant Warrant Stock |
Balance as of December 31, 2020 | ​ | $ | 95,342 | ​
Change in fair value of warrants | ​ | ​ | 66,397 | ​
Exercised warrants | ​ | ​ | (253) | ​
Balance as of March 31, 2021 | ​ | $ | 161,486 | ​
​ ​ | 4.FAIR VALUE MEASUREMENTS Fair value accounting is applied for all financial assets and liabilities that are recognized or disclosed at fair value in the financial statements on a recurring basis. At December 31, 2020 and 2019, the carrying amount of cash and cash equivalents, accounts receivable, other current assets, other assets, accounts payable, and accrued and other current liabilities approximated their estimated fair value due to their relatively short maturities. The following table provides the financial instruments measured at fair value (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | December 31, 2020
​ | ​ | Level 1 | ​ | Level 2 | ​ | Level 3 | ​ | Total
Assets |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Cash equivalents: |  | $ | 67 | ​ | $ | — |  | $ | — |  | $ | 67
Money market fund |  | ​ |  | ​ |  |  |  | ​ |  |  | ​ |
Liabilities |  | ​ |  | ​ |  |  |  | ​ |  |  | ​ |
Convertible preferred stock warrant liabilities | ​ | $ | — | ​ | $ | — | ​ | $ | 95,342 | ​ | $ | 95,342
Embedded derivative liabilities | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Total liabilities | ​ | $ | — | ​ | $ | — | ​ | $ | 95,342 | ​ | $ | 95,342
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | December 31, 2019
​ | ​ | Level 1 | ​ | Level 2 | ​ | Level 3 | ​ | Total
Assets |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Cash equivalents: | ​ | $ | 67 |  | $ | — |  | $ | — | ​ | $ | 67
Money market fund | ​ |  |  |  | ​ |  |  | ​ |  | ​ |  |
Liabilities | ​ |  |  |  | ​ |  |  | ​ |  | ​ |  |
Convertible preferred stock warrant liabilities | ​ | $ | — | ​ | $ | — | ​ | $ | 6,094 | ​ | $ | 6,094
Embedded derivative liabilities | ​ | $ | — | ​ | $ | — | ​ | $ | 786 | ​ | $ | 786
Total liabilities | ​ | $ | — | ​ | $ | — | ​ | $ | 6,880 | ​ | $ | 6,880
​ The Company’s money market funds are classified as Level 1 because they are valued using quoted market prices. The convertible preferred stock warrant liabilities and embedded derivatives are defined as Level 3 in the fair value hierarchy as the valuations are based on significant unobservable inputs, which reflect the Company’s own assumptions incorporated in valuation techniques used to determine fair value; further discussion of these assumptions is set forth below. There were no transfers into or out of Level 3 of the fair value hierarchy during the periods presented. Convertible Preferred Stock Warrant Liabilities The fair value of the detachable redeemable preferred stock warrants was determined as of December 31, 2020 and 2019 using the Black-Scholes method as well as a discount for lack of marketability. Black- Scholes inputs used to value the warrants are based on information from purchase agreements and within valuation reports prepared by an independent third party for the Company. Inputs include exercise price, volatility, fair value of common or preferred stock, expected dividend rate and risk-free interest rate. The key assumptions used for the valuation of the preferred stock warrant liabilities upon remeasurement were as follows: ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | Year Ended December 31, |
​ |  | 2020 |  | 2019 |
Volatility | ​ | 65.0 | % | 65.0 | %
Risk-free interest rate | ​ | 0.1 | % | 1.6 | %
Expected term (in years) | ​ | 1.5 |  | 2.5 | ​
Dividend yield | ​ | — | % | — | %
Discount for lack of marketability | ​ | 12.3 | % | 40.0 | %
​ The following table presents the changes in the liability for warrants on convertible preferred stock during the years ended December 31, 2020 and 2019 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2020 |  | 2019
Beginning balance at January 1, | ​ | $ | 6,094 | ​ | $ | 1,700
Issuance of warrants | ​ |  | 3,633 | ​ |  | 3,999
Change in fair value of warrants | ​ |  | 85,623 | ​ |  | 395
Exercised warrants | ​ |  | (8) | ​ |  | —
Ending balance at December 31, | ​ | $ | 95,342 | ​ | $ | 6,094
​ Embedded Derivatives The fair value of the derivative liability related to the Company’s issuance of certain convertible notes discussed in Note 11 was estimated using a with and without method. This method isolates the value of the embedded derivative by measuring the difference in the host contract’s value with and without the isolated feature. The resulting cash flows are discounted at the Company’s borrowing rate, as adjusted for fluctuations in the market interest rate from the inception of the Company’s comparative borrowings to the reporting date, to measure the fair value of the embedded derivative. The valuation for the conversion portion of the derivative factors in the expected timing and probability of a qualified financing that would result in the conversion of the underlying (refer to Note 11 for further discussion of the terms), plus accrued interest discounted to the qualified financing price per share. The probability and timing of a qualified financing are estimated at each reporting date. As of December 31, 2020, the Company determined the probability of a qualified financing to be minimal and, as such, the estimated value of the derivative is $0. The following table sets forth a summary of the changes in fair value of the embedded derivative liabilities: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31,
​ |  | 2020 |  | 2019
Beginning balance at January 1, | ​ | $ | 786 | ​ | $ | —
Issuance of derivative | ​ |  | 382 | ​ |  | 2,673
Change in fair value | ​ |  | (1,168) | ​ |  | (1,887)
Ending balance at December 31, | ​ | $ | — | ​ | $ | 786
​

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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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