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Debt | 12 Months Ended
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Dec. 31, 2020
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Debt | Note 7—Debt Note Payable In October 2016, we entered into a note payable agreement (the Note) with CRG Servicing LLC (“CRG”) and borrowed $80.0 million. In May 2018, we borrowed the remaining $45.0 million available under the Note and issued to CRG warrants to purchase up to 200,000 shares of our common stock with an exercise price of $23.00 per share and total fair value of $1.4 million. In November 2018, we issued $210.0 million in principal amount of unsecured convertible senior notes (see “Note 8—Unsecured Convertible Senior Notes”) and repaid the Note. Upon repayment, we incurred a loss on early extinguishment of debt of $13.0 million associated with the unamortized lender facility fee, debt issuance costs, debt discount and prepayment fees upon repayment of the Note. ​ Line of Credit We have a Loan and Security Agreement with Silicon Valley Bank (SVB), which provides for a $50.0 million revolving line of credit facility (the Line of Credit Agreement). Under the Line of Credit Agreement, we may draw, on a revolving basis, up to the lesser of $50.0 million and 85.0% of our eligible accounts receivable, less certain reserves. The Line of Credit Agreement is secured by all our assets excluding intellectual property and development program inventories and matures in August 2022. Interest on amounts outstanding is payable monthly at a floating rate equal to the greater of 5.50% and the prime rate per annum. If the Line of Credit Agreement is terminated prior to the maturity date for any reason other than replacement with a new SVB credit facility or a new syndicated facility in which SVB acts as the agent, we are required to pay a termination fee of $1.0 million. We paid an initial commitment fee of $150,000 upon closing and are required to pay additional commitment fees of $150,000 on each of the first and second anniversaries of the closing date, or upon the earlier termination of, or default under, the Line of Credit Agreement. The Line of Credit Agreement requires a lockbox arrangement whereby our trade accounts receivable collections are deposited into a control account. Amounts deposited in the account are transferred daily to our operating account, except that during periods of reduced liquidity or upon an event of default, the amounts received in the control account are applied to reduce the outstanding obligations under the Line of Credit Agreement. The Line of Credit Agreement includes customary events of default that include, among other things, breach, non-payment, inaccuracy of representations and warranties, the occurrence of a material adverse change in our business or prospects for repayment of the Line of Credit, cross default to material indebtedness or material agreements, bankruptcy and insolvency, material judgments and a change in control. In the event of default, SVB may require all obligations under the Line of Credit Agreement to be immediately due and payable and charge a default rate of interest thereon. Additionally, under the loan and security agreement with SVB, we have agreed not to pay any dividends. As of December 31, 2020, we had no outstanding borrowings under the Line of Credit Agreement.

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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 + Details
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