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v3.20.2

Significant Accounting Policies - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 08, 2020 | Jun. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019
Accounting Policies [Abstract] |  |  |  |  |
Accounting standards update |  |  |  | us-gaap:AccountingStandardsUpdate201613Member |
Retained earnings |  | $ (192,072) | $ (192,072) | $ (152,819) |
Unpaid obligations record as restricted assets |  | 800 | 800 | $ 300 | $ 2
Minimum protective endowment held in an interest-bearing account |  | $ 500 | $ 500 |  | $ 500
Authorized shares of common stock |  | 32,000,000 | 32,000,000 | 32,000,000 |
Common stock, par value (in dollars per share) |  | $ 0.01 | $ 0.01 | $ 0.01 |
Issued shares of common stock |  | 22,222,936 | 22,222,936 | 21,964,809 |
Outstanding shares of common stock |  | 22,222,936 | 22,222,936 | 21,964,809 |
Authorized shares of preferred stock |  | 8,000,000 | 8,000,000 | 8,000,000 |
Issued shares of preferred stock |  | 0 | 0 | 0 |
Outstanding shares of preferred stock |  | 0 | 0 | 0 |
Common stock dividends (in dollars per share) | $ 0.60 |  |  |  |
Accumulated other comprehensive income net of tax |  | $ 659 | $ 659 | $ 233 |
Tax from unrealized gains and losses on marketable securities |  |  | 252 | 90 |
Reclassifications from AOCI |  | 25 | 25 |  |
Reclassifications from AOCI, tax |  | 10 | 10 |  |
Other Assets |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Tuition receivable, noncurrent |  | $ 3,100 | $ 3,100 | 1,000 |
Cumulative Effect Period of Adoption Adjustment |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |
Retained earnings |  |  |  | $ 3,310 |

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