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Consolidated Balance Sheets - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
CURRENT ASSETS: |  |  |
Cash and cash equivalents, unrestricted |  | $ 105,684 | $ 108,687
Restricted cash |  | 4,000 |
Total cash, cash equivalents and restricted cash |  | 109,684 | 108,687
Short-term investments |  | 300,676 | 185,488
Total cash and cash equivalents, restricted cash and short-term investments |  | 410,360 | 294,175
Student receivables, gross |  | 84,599 | 84,874
Allowance for credit losses |  | (39,917) | (29,856)
Student receivables, net |  | 44,682 | 55,018
Receivables, other |  | 2,873 | 1,381
Prepaid expenses |  | 8,209 | 7,299
Inventories |  | 596 | 576
Other current assets |  | 341 | 1,936
Total current assets |  | 467,061 | 360,385
NON-CURRENT ASSETS: |  |  |
Property and equipment, net of accumulated depreciation of $101,380 and $92,933 as of December 31, 2020 and 2019, respectively | [1] | 27,761 | 26,006
Right of use asset, net |  | 44,773 | 50,366
Goodwill |  | 118,312 | 87,356
Intangible assets, net of amortization of $4,178 and $1,400 as of December 31, 2020 and 2019, respectively |  | 15,522 | 7,900
Student receivables, gross |  | 3,533 | 3,352
Allowance for credit losses |  | (2,230) | (2,108)
Student receivables, net |  | 1,303 | 1,244
Deferred income tax assets, net |  | 40,351 | 60,169
Other assets |  | 6,434 | 5,720
TOTAL ASSETS | [2] | 721,517 | 599,146
CURRENT LIABILITIES: |  |  |
Lease liability-operating |  | 9,789 | 11,784
Accounts payable |  | 13,259 | 11,533
Accrued expenses: |  |  |
Payroll and related benefits |  | 22,661 | 27,616
Advertising and marketing costs |  | 10,249 | 10,479
Income taxes |  | 1,402 | 1,376
Other |  | 11,921 | 16,378
Deferred revenue |  | 34,534 | 24,647
Total current liabilities |  | 103,815 | 103,813
NON-CURRENT LIABILITIES: |  |  |
Lease liability-operating |  | 43,405 | 52,391
Other liabilities |  | 18,390 | 11,647
Total non-current liabilities |  | 61,795 | 64,038
STOCKHOLDERS' EQUITY: |  |  |
Preferred stock, $0.01 par value; 1,000,000 shares authorized; none issued or outstanding |  |  |
Common stock, $0.01 par value; 300,000,000 shares authorized; 87,264,910 and 85,953,253 shares issued, 70,062,364 and 70,151,357 shares outstanding as of December 31, 2020 and 2019, respectively |  | 873 | 860
Additional paid-in capital |  | 658,423 | 639,335
Accumulated other comprehensive income |  | 364 | 344
Retained earnings |  | 142,335 | 18,071
Treasury stock, at cost, 17,202,546 and 15,801,896 shares as of December 31, 2020 and 2019, respectively |  | (246,088) | (227,315)
Total stockholders' equity |  | 555,907 | 431,295
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY |  | $ 721,517 | $ 599,146
[1] | Property and equipment which were fully depreciated and no longer in use by the Company were retired during the years ended December 31, 2020 and 2019; therefore, both the cost of the asset and the related accumulated depreciation balances were reduced to zero for these assets.
[2] | Total assets are presented on a consolidated basis and do not include intercompany receivable or payable activity between institutions and corporate and investments in subsidiaries.

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