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v3.20.2

Significant Accounting Policies - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 14, 2020 | Aug. 10, 2020 | Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Accounting Policies [Abstract] |  |  |  |  |  |
Retained earnings |  |  | $ (188,392) | $ (188,392) |  | $ (152,819)
Accounting standards update |  |  |  |  |  | us-gaap:AccountingStandardsUpdate201613Member
Unpaid obligations record as restricted assets |  |  | 347 | 347 | $ 2 | $ 300
Minimum protective endowment held in an interest-bearing account |  |  | $ 500 | $ 500 | 500 |
Common stock, shares authorized (in shares) |  |  | 32,000,000 | 32,000,000 |  | 32,000,000
Common stock, par value (in dollars per share) |  |  | $ 0.01 | $ 0.01 |  | $ 0.01
Common stock, shares issued (in shares) |  |  | 24,403,364 | 24,403,364 |  | 21,964,809
Common stock, shares outstanding (in shares) |  |  | 24,403,364 | 24,403,364 |  | 21,964,809
Net proceeds from issuance of common stock |  | $ 220,200 |  | $ 220,248 | $ 0 |
Underwriting discounts and offering costs |  | $ 9,200 |  |  |  |
Preferred stock, shares authorized (in shares) |  |  | 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 |  |  | $ 760 | $ 760 |  | $ 233
Tax from unrealized gains and losses on marketable securities |  |  |  | 287 |  | 90
Reclassifications from AOCI |  |  |  | 25 |  |
Reclassifications from AOCI, tax |  |  |  | $ 10 |  |
Common Stock |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Issuance of common stock (in shares) |  | 2,185,000 | 2,185,000 | 2,185,000 |  |
Other Assets |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Tuition receivable, noncurrent |  |  | $ 3,200 | $ 3,200 |  | 1,000
Cumulative Effect Period of Adoption Adjustment |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |
Retained earnings |  |  |  |  |  | $ 3,310

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