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v3.20.2

General (Details Textual) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 21, 2020 USD ($) | Sep. 30, 2020 USD ($) subsidiary | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) subsidiary | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Aug. 20, 2020 USD ($) | May 11, 2020 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Operations commenced date |  |  |  | Jan. 01, 2005 |  |  |  |
Subsidiary or equity method investee, number | subsidiary |  | 10 |  | 10 |  |  |  |
Entity incorporation, date of incorporation |  |  |  | Nov. 24, 2004 |  |  |  |
Deferred revenue, revenue recognized |  |  |  | $ 84,630,000 |  |  |  |
Sales returns |  |  |  | $ 0 |  | $ 0 |  |
Capitalized contract cost, amortization period (years) |  | 4 years |  | 4 years |  |  |  |
Gain (loss) related to the effective portion of the cash flow hedges |  | $ 127,000 | $ 361,000 | $ (177,000) | $ (170,000) |  |  |
Realized income on derivative instruments, net of tax |  | 2,271,000 | 0 | 4,742,000 | 0 |  |  |
Derivative instruments not designated as hedging instruments, gain (loss), net |  | (876,000) | 951,000 | (244,000) | 1,404,000 |  |  |
Foreign Exchange Contract |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Gain (loss) related to the effective portion of the cash flow hedges |  | 128,000 | 361,000 | (176,000) | (170,000) |  |  |
Realized income on derivative instruments, net of tax |  | 2,271,000 |  | 4,742,000 |  |  |  |
Ineffective hedges recognized |  | 0 | $ 0 | $ 0 | $ 0 |  |  |
Maintenance |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Revenue, performance obligation, description of timing |  |  |  | one year |  |  |  |
Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Debt instrument, term | 3 years |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 70,000,000 |  |  |  |  |  |  |
Line of credit facility, accordion feature, increase limit | $ 90,000,000 |  |  |  |  |  |  |
First priority perfected lien on voting capital stock, percent | 65.00% |  |  |  |  |  |  |
Debt instrument, covenant, minimum available liquidity | $ 25,000,000 |  |  |  |  |  |  |
Letter of Credit | Line of Credit |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 15,000,000 |  |  |  |  |  |  |
Long-term line of credit |  | $ 2,439,000 |  | $ 2,439,000 |  |  |  |
Promissory Note | Line of Credit |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  | $ 7,000,000 |
Credit and Security Agreement | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate (percentage) | 1.00% |  |  |  |  |  |  |
Credit and Security Agreement | Base Rate |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate (percentage) | 3.00% |  |  |  |  |  |  |
Credit and Security Agreement | Eurodollar |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate (percentage) | 0.50% |  |  |  |  |  |  |
2025 Senior Notes | Convertible Debt |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  |  | 1.25%
Principal amount |  |  |  |  |  |  |  | $ 253,000,000

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