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Debt | 12 Months Ended
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Dec. 31, 2020
Debt Disclosure [Abstract] |
Debt | Debt 2019 Revolving Credit Facility On October 4, 2019, the Company entered into a Credit Agreement with Citizens Bank, N.A., for a $10.0 million Revolving Credit Facility. Borrowings under the Revolving Credit Facility bear interest at a rate equal to, at the Company’s option, either (1) the arithmetic average of the LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits for the interest period (one, three or six months (or 12 months if agreed to by all applicable Lenders)) as selected by the Company relevant to such borrowing plus the applicable margin, or (2) a base rate determined by reference to the greatest of the federal funds rate plus 0.50%, the prime commercial lending rate as determined by the Agent, and the daily LIBOR rate plus 1.00%, in each case plus an applicable margin and subject to a floor of 0.00%. In addition, on a quarterly basis, the Company is required to pay each lender under the Revolving Credit Facility a 0.2% commitment fee in respect of commitments under the Revolving Credit Facility, which may be subject to adjustment based on the Company’s total leverage ratio. The outstanding balance under the Revolving Credit Facility as of December 31, 2020 is $10.0 million. Convertible Senior Notes On August 12, 2014, the Company issued $230.0 million aggregate principal amount of its 0.75% Convertible Senior Notes due in 2019 (the “2019 Notes”). The 2019 Notes were paid at maturity on August 15, 2019. The 2019 Notes bore an interest rate of 0.75% per annum payable semi-annually in arrears on February 15 and August 15 of each year. The Company accounted for the $230.0 million face value of the debt as a liability and capitalized approximately $7.1 million of financing fees, related to the issuance. During the years ended December 31, 2020, 2019 and 2018, interest expense was $0.2 million, $0.4 million, and $1.6 million respectively. Interest expense The following table summarizes the Company’s interest expense:
|  |  |  | Twelve Months Ended December 31,
|  |  |  |  |  |  |  | 2020 |  | 2019 |  | 2018
Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Amortization of debt issuance costs |  |  |  |  |  |  |  | $ | — |  |  | $ | 285 |  |  | 1,294 |
Interest on borrowings |  |  |  |  |  |  |  | — |  |  | 363 |  |  | 1,578 |
Additional interest on default |  |  |  |  |  |  |  | — |  |  | — |  |  | 191 |
2019 Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Amortization of debt issuance costs |  |  |  |  |  |  |  | 52 |  |  | 8 |  |  | — |
Commitment fee |  |  |  |  |  |  |  | 4 |  |  | 5 |  |  | — |
Interest on borrowings |  |  |  |  |  |  |  | 202 |  |  | 3 |  |  | — |
Capital leases |  |  |  |  |  |  |  | — |  |  | — |  |  | 964 |
Other* |  |  |  |  |  |  |  | 218 |  |  | 691 |  |  | 884 |
Total |  |  |  |  |  |  |  | $ | 476 |  |  | $ | 1,355 |  |  | $ | 4,911 |
________________________________ * Mainly finance leases’ related interest expense.

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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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