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Note 10 - Fair Value Measurement - Schedule of Carrying and Fair Value Amounts (Details) - USD ($)
$ in Thousands

Sep. 30, 2020

Dec. 31, 2019

Sep. 30, 2019

Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]

Held-to-maturity marketable securities (1)

^[1]

$ 5,700

$ 32,799

$ 47,918

Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]

2.75% Convertible Notes

^[2],[3]

198,606

193,696

0

Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Revolving Credit Facility [Member]

Credit Agreement - revolving credit facility

^[3]

75,000

25,000

250,000

Reported Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Term Loan [Member]

Notes

^[3]

133,125

138,750

140,625

Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]

Held-to-maturity marketable securities (1)

^[1]

5,696

32,792

47,856

Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]

2.75% Convertible Notes

^[2],[3]

184,000

249,895

0

Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Revolving Credit Facility [Member]

Credit Agreement - revolving credit facility

^[3]

76,180

25,043

251,986

Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Term Loan [Member]

Notes

^[3]

$ 135,046

$ 139,042

$ 141,634

[1]	All marketable securities were classified as held-to-maturity and consisted of U.S. Government and agency obligations as of September 30, 2020, December 31, 2019 and September 30, 2019.
[2]	Excluded from carrying value is $31.4 million and $36.3 million debt discount of as of September 30, 2020 and December 31, 2019, respectively, related to the 2.75% Convertible Notes (see Note 14).
[3]	The fair value of the 2.75% Convertible Notes is based on the median price of the notes in an active market as of September 30, 2020 and December 31, 2019. The fair value of the Credit Agreement is based on borrowing rates available to us for long-term loans with similar terms, average maturities, and credit risk. See Note 14 for definitions of, and more information about, the Credit Agreement and 2.75% Convertible Notes.

X

- Definition

Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

+ References

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X

- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

+ References

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X

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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X

- Definition

Fair value portion of notes payable.

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