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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Accounting Policies [Abstract] |
Schedule of impact of accounting standards update adoption | The impact of adoption of ASC 326 on the Company's balance sheet was as follows (in thousands):
| As of January 1, 2020
| As Reported Under ASC 326 |  | Pre-ASC 326 Adoption |  | Impact of ASC 326 Adoption
Tuition receivable, net | $ | 46,952 |  |  | $ | 51,523 |  |  | $ | (4,571) |
Deferred income tax liabilities | $ | 46,681 |  |  | $ | 47,942 |  |  | $ | (1,261) |
Retained earnings | $ | 149,509 |  |  | $ | 152,819 |  |  | $ | (3,310) |
Schedule of cash, cash equivalents, and restricted cash | The following table illustrates the reconciliation of cash, cash equivalents, and restricted cash shown in the consolidated statements of cash flows as of December 31, 2019 and 2020 (in thousands):
| As of December 31,
| 2019 |  | 2020
Cash and cash equivalents | $ | 419,693 |  |  | $ | 187,509 |
Restricted cash included in other current assets | 304 |  |  | 14,011 |
Restricted cash included in other assets | 500 |  |  | 500 |
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows | $ | 420,497 |  |  | $ | 202,020 |
Schedule of tuition receivable and allowance for credit losses | The Company’s tuition receivable and allowance for credit losses were as follows as of December 31, 2019 and 2020 (in thousands):
| December 31, 2019 |  | December 31, 2020
Tuition receivable | $ | 82,454 |  |  | $ | 99,942 |
Allowance for credit losses | (30,931) |  |  | (49,773) |
Tuition receivable, net | $ | 51,523 |  |  | $ | 50,169 |
Schedule of allowance for credit losses | The following table illustrates changes in the Company’s allowance for credit losses for each of the three years ended December 31, 2020 (in thousands):
| 2018 |  | 2019 |  | 2020
Allowance for credit losses, beginning of period | $ | 12,687 |  |  | $ | 28,457 |  |  | $ | 30,931 |
Impact of adopting ASC 326 | — |  |  | — |  |  | 4,571 |
Additions charged to expense | 37,704 |  |  | 49,072 |  |  | 49,130 |
Additions from merger | 6,601 |  |  | 2,207 |  |  | 3,503 |
Write-offs, net of recoveries | (28,535) |  |  | (48,805) |  |  | (38,362) |
Allowance for credit losses, end of period | $ | 28,457 |  |  | $ | 30,931 |  |  | $ | 49,773 |
Schedule of reconciliation of shares used to calculate basic and diluted earnings (loss) per share | Set forth below is a reconciliation of shares used to calculate basic and diluted earnings (loss) per share for each of the three years ended December 31, 2020 (in thousands):
| 2018 |  | 2019 |  | 2020
Weighted average shares outstanding used to compute basic earnings per share | 15,190 |  |  | 21,725 |  |  | 22,633 |
Incremental shares issuable upon the assumed exercise of stock options | — |  |  | 54 |  |  | 14 |
Unvested restricted stock and restricted stock units | — |  |  | 318 |  |  | 213 |
Shares used to compute diluted earnings (loss) per share | 15,190 |  |  | 22,097 |  |  | 22,860 |
Anti-dilutive shares excluded from the diluted earnings per share calculation | 611 |  |  | 16 |  |  | 63 |

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