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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands, shares in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Accounting Policies [Abstract] |  |  |  |  |
Unsatisfied performance obligation | $ 54,200 |  | $ 54,200 |  |
Allowance for doubtful accounts | 3,236 |  | 3,236 |  | $ 3,346
Unearned revenue | 9,371 |  | 9,371 |  | $ 10,704
Prior year unearned revenue recognized in period |  |  | 9,200 |  |
Share-based compensation costs | $ 3,000 | $ 2,800 | $ 7,200 | $ 8,500 |
Antidilutive securities excluded from computation of Earnings Per Share, amount |  |  | 2.3 |  |

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- Definition Amount of allowance for credit loss on accounts receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118955202&loc=SL82895884-210446 + Details
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