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Borrowings	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Borrowings	5. Borrowings April 2020 Note Purchase Agreement On April 9, 2020, the Company entered into the April 2020 Note Purchase Agreement with Puissance Life Science Opportunities Fund VI (“Puissance”) and issued and sold to Puissance $10.0 million aggregate principal amount of its April 2020 Notes, resulting in net proceeds of approximately $9.5 million after deducting $0.5 million for an advisory fee and other issuance costs.  At December 31, 2020, the fair value of the April 2020 Notes was $7.4 million.   In January 2021, Puissance converted the remaining $6.0 million of the April 2020 Notes for 959,080 shares of common stock.  Upon conversion of the $6.0 million of the April 2020 Notes, the Company recognized a $2.7 million extinguishment loss which represents the difference between the total net carrying amount of the convertible debt and derivative liability of $4.8 million and the fair value of the consideration issued of $7.5 million.   March 2019 Note Purchase Agreement On March 7, 2019, the Company entered into a Senior Convertible Note Purchase Agreement (the “March 2019 Note Purchase Agreement”) with Puissance.  Pursuant to the March 2019 Note Purchase Agreement, on March 7, 2019, the Company issued and sold to Puissance $16.0 million aggregate principal amount of its 6.0% Senior Convertible Notes due 2025 (“March 2019 Notes”), resulting in $14.7 million in net proceeds after deducting $1.3 million for an advisory fee and other issuance costs.   As of March 31, 2021, the Company’s March 2019 Notes consists of the convertible debt balance of $9.6 million, presented net of the unamortized debt issuance costs allocated to the convertible debt of $0.4 million, and the bifurcated embedded conversion option derivative liability of $2.6 million.  In connection with the Company’s issuance of its March 2019 Notes, the Company bifurcated the embedded conversion option, inclusive of the interest make-whole provision and make-whole fundamental change provision, and recorded the embedded conversion option as a long-term derivative liability in the Company’s balance sheet in accordance with ASC 815, Derivatives and Hedging, at its initial fair value of $7.0 million as the interest make-whole provision is settled in shares of common stock.  For the three months ended March 31, 2021 and 2020, the Company recognized gains of $42,000 and $0.7 million, respectively, on the fair value adjustment for the derivative liability.  For each of the three months ended March 31, 2021 and 2020, the Company recognized $0.3 million in amortization of debt issuance costs and discount related to the March 2019 Notes.   The Company estimated the fair value of the convertible debt and derivative liability for the March 2019 Notes using a binomial lattice valuation model and Level 3 inputs. At both March 31, 2021 and December 31, 2020, the fair value of the convertible debt and derivative liability for the March 2019 Notes is $12.9 million. The March 2019 Notes were issued and sold for cash at a purchase price equal to 100% of their principal amount, in reliance on the exemption from registration provided by Section 4(a)(2) of the Securities Act of 1933, as amended (the “Securities Act”), due to the March 2019 Notes being issued to one financially sophisticated investor. The March 2019 Notes bear interest at a rate of 6.0% per annum payable semiannually in arrears on March 15 and September 15 of each year, beginning September 15, 2019. The March 2019 Notes will mature on March 15, 2025, unless earlier converted, redeemed or repurchased. The March 2019 Notes constitute general, senior unsecured obligations of the Company. The holder of the March 2019 Notes may convert their March 2019 Notes at their option at any time prior to the close of business on the business day immediately preceding March 15, 2025 into shares of the Company’s common stock. The initial conversion rate is 73.9096 shares of common stock per $1,000 principal amount of March 2019 Notes, which is equivalent to an initial conversion price of approximately $13.53 and is subject to adjustment in certain events described in the March 2019 Note Purchase Agreement. The Holder upon conversion may also be entitled to receive, under certain circumstances, an interest make-whole payment payable in shares of common stock. In addition, following certain corporate events that occur prior to the maturity date, the Company will, in certain circumstances, increase the conversion rate if the holder elects to convert its March 2019 Notes in connection with such a corporate event. Subject to adjustment in the conversion rate, the number of shares that the Company may deliver in connection with a conversion of the March 2019 Notes, including those delivered in connection with an interest make-whole payment, will not exceed a cap of 81 shares of common stock per $1,000 principal amount of the March 2019 Notes.   On or after March 15, 2022, the Company has the right, at its election, to redeem all or any portion of the March 2019 Notes not previously converted if the last reported sale price per share of common stock exceeds 130% of the conversion price on each of at least 20 trading days (whether or not consecutive) during the 30 consecutive trading days ending on, and including, the trading day immediately before the date the Company sends the related redemption notice. The redemption price will be 100% of the principal amount of the March 2019 Notes to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date.  If a “fundamental change” (as defined in the March 2019 Note Purchase Agreement) occurs, then, subject to certain exceptions, the Company must offer to repurchase the March 2019 Notes for cash at a repurchase price of 100% of the principal amount of the March 2019 Notes to be repurchased, plus accrued and unpaid interest to, but excluding, the repurchase date.

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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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