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Summary of Operations and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2021
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):
|  | 2021 |  |  | 2020 |  |  | 2019 |
Balance at January 1, |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 757 |  |  | $ | 888 |  |  | $ | 533 |
Charges to expense |  |  | 193 |  |  |  | 125 |  |  |  | 459 |
Write-offs of uncollectible accounts, net of recoveries |  |  | (490 | ) |  |  | (256 | ) |  |  | (104 | )
Balance at December 31, |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 460 |  |  | $ | 757 |  |  | $ | 888 |
Summary of Property, Equipment and Software Over Estimated Useful Life | Depreciation of property and equipment and amortization of 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, software and software development costs |  | 3 - 10
Leasehold improvements |  | 1 - 7
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, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Cash and cash equivalents |  | $ | 69,405 |  |  | $ | 68,688 |  |  | $ | 44,570 |
Restricted cash, included in restricted cash and investments |  |  | 9,224 |  |  |  | 165,149 |  |  |  | 228,771 |
Total cash, cash equivalents and restricted cash shown in the statement of cash flows |  | $ | 78,629 |  |  | $ | 233,837 |  |  | $ | 273,341 |
Summary of Basic and Diluted Common Shares Outstanding | Basic and diluted shares outstanding are summarized as follows (in thousands):
|  | Year Ended |
|  | December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Weighted average number of basic shares outstanding |  |  | 7,540 |  |  |  | 7,577 |  |  |  | 7,451 |
Effect of dilutive securities |  |  | 81 |  |  |  | 111 |  |  |  | 248 |
Weighted average number of diluted shares outstanding |  |  | 7,621 |  |  |  | 7,688 |  |  |  | 7,699 |

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