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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Schedule Of Significant Accounting Policies [Line Items] |  |
Maximum maturity period of highly liquid investments | 3 months |
Allowances for doubtful accounts | $ 749,000 | $ 711,000
Accruals for premium deficiency | 0 | 0
Fair value, assets, level 1 to level 2 transfers | 0 | 0
Fair value, assets, level 2 to level 1 transfers | 0 | 0
Fair value, liabilities, level 1 to level 2 transfers | 0 | 0
Fair value, liabilities, level 2 to level 1 transfers | $ 0 | $ 0
Software [Member] |  |
Schedule Of Significant Accounting Policies [Line Items] |  |
Useful life of property and equipment | 3 years |
Minimum [Member] |  |
Schedule Of Significant Accounting Policies [Line Items] |  |
Short-term investment maturity period | 3 months |
Useful life of property and equipment | 3 years |
Maximum [Member] |  |
Schedule Of Significant Accounting Policies [Line Items] |  |
Useful life of property and equipment | 27 years 6 months |

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- Definition The carrying value as of the balance sheet date of the estimated valuation allowance to reduce gross premiums receivable to net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(5)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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