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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands, shares in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Accounting Policies [Abstract] |  |  |
Unsatisfied performance obligation | $ 53,200 |  |
Allowance for doubtful accounts | 4,000 |  | $ 3,500
Unearned revenue | 8,572 |  | $ 11,678
Prior year unearned revenue recognized in period | 6,000 |  |
Share-based compensation costs | $ 4,200 | $ 5,800 |
Antidilutive securities excluded from computation of Earnings Per Share, amount | 2.2 | 1.4 |

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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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