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Summary of Significant Accounting Policies - Schedule of Changes in Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Jun. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2018
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Balance, beginning of period | $ 4,851 | $ 3,568 | $ 3,568 | $ 3,568 | $ 3,568
Add: provision for doubtful accounts | 828 | 325 | 1,791 | 3,254 | 5,826
Less: write-offs, net of recoveries and other adjustments | (1,346) | 5 | (2,526) | (2,514) | (4,543)
Balance, end of period | $ 4,333 | 3,898 | 2,833 | 4,308 | 4,851
As reported |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Balance, beginning of period |  | 3,568 | 3,568 | 3,568 | $ 3,568
Add: provision for doubtful accounts |  | 1,691 | 3,822 | 5,917 |
Less: write-offs, net of recoveries and other adjustments |  | 5 | (2,526) | (2,514) |
Balance, end of period |  | $ 5,264 | $ 4,864 | $ 6,971 |

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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company 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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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130534-203044 + Details
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