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Term Loan Payable	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Term Loan Payable	6. Term Loan Payable In November 2016, the Company entered into a loan and security agreement with Silicon Valley Bank (“SVB”) and borrowed $3.5 million as a term loan. The outstanding principal amount of the term loan accrues interest at an annual rate of 1.75% per annum. At closing, the Company incurred de minimis debt issuance costs and owed a final payment fee of $0.3 million, both of which are amortized to interest expense over the remaining term of the debt under the effective interest method. The effective interest rate of the Company’s term loan is 5.14%. Interest expense under the term loan totaled less than $0.1 million for each of the three months ended March 31, 2021 and 2020. The term loan is collateralized by the Company’s tangible and intangible assets, excluding intellectual property. The proceeds are to be used as working capital and to fund general business requirements. The agreement includes customary nonfinancial covenants and events of default that include, among other things, non-payment, inaccuracy of representations and warranties, covenant breaches, cross default to material indebtedness or material agreements, bankruptcy and insolvency, material judgments, a change of control, or any material adverse event. The Company was in compliance with all related covenants as of March 31, 2021. The term loan’s original maturity date was November 1, 2020. However, in April 2020, the Company amended the loan and security agreement to defer principal payments for six months and extend the maturity date to May 1, 2021. There were no costs or additional warrant issuances in connection with this amendment. The Company accounted for the amendment as a debt modification and is amortizing the remaining debt discount over the remaining term. On May 1, 2021, the Company made its final scheduled payment to SVB under the loan and security agreement including the final payment fee.

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- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-URI http://asc.fasb.org/topic&trid=2208564

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