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Summary of Operations and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract] |
Summary of Allowance for Doubtful Accounts | Our allowance for doubtful accounts activity is summarized as follows (in thousands):
|  | 2019 |  |  | 2018 |  |  | 2017 |
Balance at January 1, |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 533 |  |  | $ | 265 |  |  | $ | 78 |
Charges to expense |  |  | 459 |  |  |  | 268 |  |  |  | 192 |
Write-offs of uncollectible accounts, net of recoveries |  |  | (104 | ) |  |  | — |  |  |  | (5 | )
Balance at December 31, |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 888 |  |  | $ | 533 |  |  | $ | 265 |
Property Plant And Equipment Estimated Useful Life Table Text Block | Depreciation of property, equipment and software is calculated using the straight-line method over estimated useful lives of the related assets or lease terms, as follows:
|  | Years
Buildings |  | 39
Office furniture and fixtures |  | 7
Computer hardware and software |  | 3-10
Leasehold improvements |  | Shorter of lease term or estimated useful life
Schedule of Reconciles of Cash, Cash Equivalents and Restricted Cash Balances | The table below reconciles the cash, cash equivalents and restricted cash balances from our consolidated balance sheets to the amounts reported on the consolidated statements of cash flows (in thousands):
|  | December 31, |  |  | December 31, |  |  | December 31, |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Cash and cash equivalents |  | $ | 44,570 |  |  | $ | 35,371 |  |  | $ | 59,835 |
Restricted cash, included in restricted cash and investments |  |  | 228,771 |  |  |  | 105,331 |  |  |  | 60,370 |
Total cash, cash equivalents and restricted cash shown in the statement of cash flows |  | $ | 273,341 |  |  | $ | 140,702 |  |  | $ | 120,205 |
Summary of Basic and Diluted Common Shares Outstanding | Basic and diluted shares outstanding are summarized as follows (in thousands):
|  | Year Ended |
|  | December 31, |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Weighted average number of basic shares outstanding |  |  | 7,451 |  |  |  | 7,342 |  |  |  | 7,275 |
Effect of dilutive securities |  |  | 248 |  |  |  | 305 |  |  |  | 276 |
Weighted average number of diluted shares outstanding |  |  | 7,699 |  |  |  | 7,647 |  |  |  | 7,551 |

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