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Recent Accounting Pronouncements - Quantitative Effect of Topics 606 and 340-40 Adoption (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |  |
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Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2019 | Dec. 31, 2017
Assets, Current [Abstract] |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 137,598 |  | $ 121,101 |  | $ 81,183 |  |  |
Accounts receivable, net |  |  |  | 204,501 |  | 184,565 |  |  |
Prepaid income taxes |  | 7,307 |  | 4,543 |  | 5,085 |  |  |
Prepaid and other current assets | [1] |  |  | 23,413 |  | 12,390 |  |  |
Total current assets |  | 338,910 |  | 353,558 |  | 283,223 |  |  |
Property and equipment, net |  |  |  | 29,632 |  | 29,393 |  |  |
Intangible assets, net |  | 46,560 |  | 46,313 |  | 54,001 |  |  |
Goodwill |  | 542,239 |  | 480,065 |  | 446,318 |  |  | $ 336,982
Investment in joint venture |  |  |  | 1,725 |  |  |  |  |
Deferred income taxes |  | 44,543 |  | 51,068 |  | 81,066 |  |  |
Other assets |  | 37,689 |  | 32,238 | [1] | 29,595 | [1] |  |
Total assets |  | 1,090,497 |  | 994,599 |  | 923,596 |  |  |
Liabilities, Current [Abstract] |  |  |  |  |  |  |  |  |
Accounts payable |  | 15,086 |  | 17,669 |  | 8,567 |  |  |
Accruals and other current liabilities |  |  |  | 167,517 |  | 136,699 |  |  |
Deferred revenues |  | 173,578 |  | 204,991 |  | 287,682 |  |  |
Income taxes payable |  | 5,100 |  | 2,236 |  | 2,794 |  |  |
Total current liabilities |  | 422,259 |  | 392,413 |  | 435,742 |  |  |
Total carrying value of debt |  | 589,583 |  | 233,750 |  | 258,750 |  |  |
Deferred revenues |  | 6,322 |  | 8,154 |  | 49,769 |  |  |
Deferred income taxes |  | 9,502 |  | 8,260 |  | 10,470 |  |  |
Income taxes payable |  | 7,874 |  | 8,140 |  | 12,904 |  |  |
Other liabilities |  | 15,229 |  | 9,263 |  | 8,530 |  |  |
Total liabilities |  | 1,083,324 |  | 659,980 |  | 776,165 |  |  |
Stockholders' Equity Attributable to Parent [Abstract] |  |  |  |  |  |  |  |  |
Class A Common Stock, $0.01 par value, authorized 100,000,000 shares; issued 11,601,757 shares as of September 30, 2020 and December 31, 2019, and Class B Common Stock, $0.01 par value, authorized 1,800,000,000 shares; issued 251,093,655 and 243,241,192 shares as of September 30, 2020 and December 31, 2019, respectively (Note 13) |  | 2,622 |  | 2,548 |  | 2,502 |  |  |
Additional paid-in capital |  | 441,723 |  | 408,667 |  | 392,896 |  |  |
Accumulated other comprehensive loss |  | (29,211) |  | (23,927) |  | (29,414) |  |  | (18,540)
Accumulated deficit |  | (407,961) |  | (52,669) | [2] | (218,553) | [2] |  |
Total stockholders' equity |  | 7,173 | $ 306,583 | 334,619 |  | 147,431 |  |  | $ 52,167
Total liabilities and stockholders' equity |  | 1,090,497 |  | 994,599 |  | 923,596 |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |
Total revenues |  | 581,977 | 533,732 | 736,654 |  | 691,710 |  |  |
Cost of Revenue [Abstract] |  |  |  |  |  |  |  |  |
Total cost of revenues |  | 116,592 | 104,249 | 144,150 |  | 131,324 |  |  |
Gross profit |  | 465,385 | 429,483 | 592,504 |  | 560,386 |  |  |
Operating Expenses [Abstract] |  |  |  |  |  |  |  |  |
Research and development |  | 139,570 | 136,617 | 183,552 |  | 175,032 |  |  |
Selling and marketing |  | 107,551 | 111,889 | 155,294 |  | 160,635 |  |  |
General and administrative |  | 85,275 | 71,415 | 97,580 |  | 89,328 |  |  |
Amortization of Purchased Intangibles |  |  |  | 14,213 |  | 14,000 |  |  |
Total operating expenses |  | 369,510 | 330,323 | 450,639 |  | 438,995 |  |  |
Income from operations |  | 95,875 | 99,160 | 141,865 |  | 121,391 |  |  |
Interest expense, net |  |  |  | (8,199) |  | (8,765) |  |  |
Other income (expense), net |  | 6,756 | (14,053) | (5,557) |  | 236 |  |  |
Income before income taxes |  | 98,181 | 78,604 | 128,109 |  | 112,862 |  |  |
Provision for income taxes |  | 22,145 | 11,759 | 23,738 |  | (29,250) |  |  |
Equity in loss of joint venture, net of tax |  | 1,447 | 0 | 1,275 |  |  |  |  |
Net income |  | 74,589 | 66,845 | 103,096 |  | 142,112 |  |  |
Accumulated deficit |  | (407,961) |  | (52,669) | [2] | (218,553) | [2] |  |
Subscriptions |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |
Total revenues |  | 501,011 | 445,338 | 608,300 |  | 557,421 |  |  |
Perpetual licenses |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |
Total revenues |  | 36,020 | 38,255 | 59,693 |  | 61,065 |  |  |
Subscriptions and licenses |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |
Total revenues |  | 537,031 | 483,593 | 667,993 |  | 618,486 |  |  |
Cost of Revenue [Abstract] |  |  |  |  |  |  |  |  |
Total cost of revenues |  | 66,466 | 48,201 | 71,578 |  | 55,113 |  |  |
Services |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |
Total revenues |  | 44,946 | 50,139 | 68,661 |  | 73,224 |  |  |
Cost of Revenue [Abstract] |  |  |  |  |  |  |  |  |
Total cost of revenues |  | $ 50,126 | $ 56,048 | 72,572 |  | $ 76,211 |  |  |
ASU 2014-09 and ASC Topic 340-40 | Cumulative Effect, Period of Adoption, Adjustment, Net Of Tax |  |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent [Abstract] |  |  |  |  |  |  |  |  |
Accumulated deficit |  |  |  |  |  |  |  | $ 107,822 |
Operating Expenses [Abstract] |  |  |  |  |  |  |  |  |
Accumulated deficit |  |  |  |  |  |  |  | $ 107,822 |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |  |  |  |
Assets, Current [Abstract] |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  | 121,101 |  |  |  |  |
Accounts receivable, net |  |  |  | 204,268 |  |  |  |  |
Prepaid income taxes |  |  |  | 6,732 |  |  |  |  |
Prepaid and other current assets | [1] |  |  | 20,080 |  |  |  |  |
Total current assets |  |  |  | 352,181 |  |  |  |  |
Property and equipment, net |  |  |  | 29,632 |  |  |  |  |
Intangible assets, net |  |  |  | 46,313 |  |  |  |  |
Goodwill |  |  |  | 480,065 |  |  |  |  |
Investment in joint venture |  |  |  | 1,725 |  |  |  |  |
Deferred income taxes |  |  |  | 72,611 |  |  |  |  |
Other assets | [1] |  |  | 26,517 |  |  |  |  |
Total assets |  |  |  | 1,009,044 |  |  |  |  |
Liabilities, Current [Abstract] |  |  |  |  |  |  |  |  |
Accounts payable |  |  |  | 17,669 |  |  |  |  |
Accruals and other current liabilities |  |  |  | 167,225 |  |  |  |  |
Deferred revenues |  |  |  | 282,070 |  |  |  |  |
Income taxes payable |  |  |  | 1,030 |  |  |  |  |
Total current liabilities |  |  |  | 467,994 |  |  |  |  |
Total carrying value of debt |  |  |  | 233,750 |  |  |  |  |
Deferred revenues |  |  |  | 56,121 |  |  |  |  |
Deferred income taxes |  |  |  | 7,627 |  |  |  |  |
Income taxes payable |  |  |  | 6,321 |  |  |  |  |
Other liabilities |  |  |  | 9,263 |  |  |  |  |
Total liabilities |  |  |  | 781,076 |  |  |  |  |
Stockholders' Equity Attributable to Parent [Abstract] |  |  |  |  |  |  |  |  |
Class A Common Stock, $0.01 par value, authorized 100,000,000 shares; issued 11,601,757 shares as of September 30, 2020 and December 31, 2019, and Class B Common Stock, $0.01 par value, authorized 1,800,000,000 shares; issued 251,093,655 and 243,241,192 shares as of September 30, 2020 and December 31, 2019, respectively (Note 13) |  |  |  | 2,548 |  |  |  |  |
Additional paid-in capital |  |  |  | 408,667 |  |  |  |  |
Accumulated other comprehensive loss |  |  |  | (23,086) |  |  |  |  |
Accumulated deficit | [2] |  |  | (160,161) |  |  |  |  |
Total stockholders' equity |  |  |  | 227,968 |  |  |  |  |
Total liabilities and stockholders' equity |  |  |  | 1,009,044 |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |
Total revenues |  |  |  | 734,849 |  |  |  |  |
Cost of Revenue [Abstract] |  |  |  |  |  |  |  |  |
Total cost of revenues |  |  |  | 144,011 |  |  |  |  |
Gross profit |  |  |  | 590,838 |  |  |  |  |
Operating Expenses [Abstract] |  |  |  |  |  |  |  |  |
Research and development |  |  |  | 183,552 |  |  |  |  |
Selling and marketing |  |  |  | 155,274 |  |  |  |  |
General and administrative |  |  |  | 97,580 |  |  |  |  |
Amortization of Purchased Intangibles |  |  |  | 14,213 |  |  |  |  |
Total operating expenses |  |  |  | 450,619 |  |  |  |  |
Income from operations |  |  |  | 140,219 |  |  |  |  |
Interest expense, net |  |  |  | (8,199) |  |  |  |  |
Other income (expense), net |  |  |  | (5,557) |  |  |  |  |
Income before income taxes |  |  |  | 126,463 |  |  |  |  |
Provision for income taxes |  |  |  | 21,762 |  |  |  |  |
Equity in loss of joint venture, net of tax |  |  |  | 1,275 |  |  |  |  |
Net income |  |  |  | 103,426 |  |  |  |  |
Accumulated deficit | [2] |  |  | (160,161) |  |  |  |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Subscriptions |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |
Total revenues |  |  |  | 613,925 |  |  |  |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Perpetual licenses |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |
Total revenues |  |  |  | 52,519 |  |  |  |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Subscriptions and licenses |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |
Total revenues |  |  |  | 666,444 |  |  |  |  |
Cost of Revenue [Abstract] |  |  |  |  |  |  |  |  |
Total cost of revenues |  |  |  | 71,439 |  |  |  |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Services |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |
Total revenues |  |  |  | 68,405 |  |  |  |  |
Cost of Revenue [Abstract] |  |  |  |  |  |  |  |  |
Total cost of revenues |  |  |  | 72,572 |  |  |  |  |
Impact from the adoption of Topic 606 and Topic 340-40 |  |  |  |  |  |  |  |  |
Assets, Current [Abstract] |  |  |  |  |  |  |  |  |
Accounts receivable, net |  |  |  | 233 |  |  |  |  |
Prepaid income taxes |  |  |  | (2,189) |  |  |  |  |
Prepaid and other current assets | [1] |  |  | 3,333 |  |  |  |  |
Total current assets |  |  |  | 1,377 |  |  |  |  |
Deferred income taxes |  |  |  | (21,543) |  |  |  |  |
Other assets | [1] |  |  | 5,721 |  |  |  |  |
Total assets |  |  |  | (14,445) |  |  |  |  |
Liabilities, Current [Abstract] |  |  |  |  |  |  |  |  |
Accruals and other current liabilities |  |  |  | 292 |  |  |  |  |
Deferred revenues |  |  |  | (77,079) |  |  |  |  |
Income taxes payable |  |  |  | 1,206 |  |  |  |  |
Total current liabilities |  |  |  | (75,581) |  |  |  |  |
Deferred revenues |  |  |  | (47,967) |  |  |  |  |
Deferred income taxes |  |  |  | 633 |  |  |  |  |
Income taxes payable |  |  |  | 1,819 |  |  |  |  |
Total liabilities |  |  |  | (121,096) |  |  |  |  |
Stockholders' Equity Attributable to Parent [Abstract] |  |  |  |  |  |  |  |  |
Accumulated other comprehensive loss |  |  |  | (841) |  |  |  |  |
Accumulated deficit | [2] |  |  | 107,492 |  |  |  |  |
Total stockholders' equity |  |  |  | 106,651 |  |  |  |  |
Total liabilities and stockholders' equity |  |  |  | (14,445) |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |
Total revenues |  |  |  | 1,805 |  |  |  |  |
Cost of Revenue [Abstract] |  |  |  |  |  |  |  |  |
Total cost of revenues |  |  |  | 139 |  |  |  |  |
Gross profit |  |  |  | 1,666 |  |  |  |  |
Operating Expenses [Abstract] |  |  |  |  |  |  |  |  |
Selling and marketing |  |  |  | 20 |  |  |  |  |
Total operating expenses |  |  |  | 20 |  |  |  |  |
Income from operations |  |  |  | 1,646 |  |  |  |  |
Income before income taxes |  |  |  | 1,646 |  |  |  |  |
Provision for income taxes |  |  |  | 1,976 |  |  |  |  |
Net income |  |  |  | (330) |  |  |  |  |
Accumulated deficit | [2] |  |  | 107,492 |  |  |  |  |
Impact from the adoption of Topic 606 and Topic 340-40 | Subscriptions |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |
Total revenues |  |  |  | (5,625) |  |  |  |  |
Impact from the adoption of Topic 606 and Topic 340-40 | Perpetual licenses |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |
Total revenues |  |  |  | 7,174 |  |  |  |  |
Impact from the adoption of Topic 606 and Topic 340-40 | Subscriptions and licenses |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |
Total revenues |  |  |  | 1,549 |  |  |  |  |
Cost of Revenue [Abstract] |  |  |  |  |  |  |  |  |
Total cost of revenues |  |  |  | 139 |  |  |  |  |
Impact from the adoption of Topic 606 and Topic 340-40 | Services |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |
Total revenues |  |  |  | 256 |  |  |  |  |
Prepaid Expenses and Other Current Assets [Member] |  |  |  |  |  |  |  |  |
Operating Expenses [Abstract] |  |  |  |  |  |  |  |  |
Contract cost assets |  |  |  | 2,690 |  |  |  |  |
Other Assets [Member] |  |  |  |  |  |  |  |  |
Operating Expenses [Abstract] |  |  |  |  |  |  |  |  |
Contract cost assets |  |  |  | $ 5,235 |  |  |  |  |
[1] | As of December 31, 2019, contract cost assets of $2,690 were included in Prepaid and other current assets and $5,235 were included in Other assets.
[2] | Included in Accumulated deficit on the opening balance of January 1, 2019 is $107,822, net of tax, for the cumulative effect adjustment of adopting Topics 606 and 34040.

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