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Convertible Notes | 12 Months Ended
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Dec. 31, 2020
Convertible Notes |
Convertible Notes | Note 10. Convertible Notes The carrying amount and fair value of our convertible notes were as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​
​ | ​ | 2020 | ​ | 2019 | ​
​ |  | Carrying |  | ​ | ​ |  | Carrying |  | ​ | ​ |
​ | ​ | Amount | ​ | Fair Value | ​ | Amount | ​ | Fair Value | ​
1.25% Convertible Senior Notes due 2020 | ​ | $ | — | ​ | $ | — | ​ | $ | 18,300 | ​ | $ | 32,511 | ​
​ The fair value as of December 31, 2019 of the 1.25% Convertible Senior Notes that matured on November 15, 2020 (the “2020 Notes”) was based on data from readily available pricing sources which utilize market observable inputs and other characteristics for similar types of instruments, and, therefore, is classified within Level 2 in the fair value hierarchy. Prior to May 14, 2014, the 2020 Notes were not convertible except in connection with a make-whole fundamental change, as defined in the indenture. Beginning on, and including, May 15, 2014, the 2020 Notes were convertible prior to the close of business on the business day immediately preceding May 15, 2020 only under the following circumstances: (i) during any calendar quarter commencing after the calendar quarter ending on March 31, 2014 (and only during such calendar quarter), if the last reported sale price of our common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price for the 2020 Notes on each applicable trading day; (ii) during the five business day period after any five consecutive trading day period (the “measurement period”) in which the trading price per $1,000 principal amount of the 2020 Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of our common stock and the conversion rate for the 2020 Notes on each such trading day; or (iii) upon the occurrence of specified corporate events. On or after May 15, 2020 until the close of business on the second scheduled trading day immediately preceding the maturity date, the 2020 Notes were convertible at any time, regardless of the foregoing circumstances. Upon conversion we had the option to pay or deliver, as the case may be, cash, shares of common stock or a combination of cash and shares of common stock. The initial conversion rate for the 2020 Notes was 19.3207 shares of common stock per $1,000 principal amount, equivalent to an initial conversion price of approximately $51.76 per share. Prior to maturity on November 15, 2020, we settled, upon conversion, the remaining 2020 Notes principal balance in shares of common stock.

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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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