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Summary of Operations and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
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):
|  | 2018 |  |  | 2017 |  |  | 2016 |
Balance at January 1, |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 265 |  |  | $ | 78 |  |  | $ | 268 |
Charges to expense |  |  | 268 |  |  |  | 192 |  |  |  | (115 | )
Write-offs of uncollectible accounts, net of recoveries |  |  | — |  |  |  | (5 | ) |  |  | (75 | )
Balance at December 31, |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 533 |  |  | $ | 265 |  |  | $ | 78 |
Property Plant And Equipment Estimated Useful Life Table Text Block | Depreciation of property, equipment and software is calculated using either straight-line or accelerated methods 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, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Cash and cash equivalents |  | $ | 35,371 |  |  | $ | 59,835 |  |  | $ | 50,768 |
Restricted cash, included in restricted cash and investments |  |  | 105,331 |  |  |  | 60,370 |  |  |  | 290,562 |
Total cash, cash equivalents and restricted cash shown in the statement of cash flows |  | $ | 140,702 |  |  | $ | 120,205 |  |  | $ | 341,330 |
Summary of Basic and Diluted Common Shares Outstanding | Basic and diluted shares outstanding are summarized as follows (in thousands):
|  | Year Ended |
|  | December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Weighted average number of basic shares outstanding |  |  | 7,342 |  |  |  | 7,275 |  |  |  | 7,226 |
Effect of dilutive securities |  |  | 305 |  |  |  | 276 |  |  |  | 152 |
Weighted average number of diluted shares outstanding |  |  | 7,647 |  |  |  | 7,551 |  |  |  | 7,378 |

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- Definition Tabular disclosure of the activity in the total allowance for credit losses related to financing receivables (such as loans or lease receivables) for entities that have an unclassified balance sheet, including the balance in the allowance at the beginning and end of each period, additions charged to operations, direct write-downs charged against the allowance, and recoveries of amounts previously charged off. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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