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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 171,899 | $ 68,363
Marketable securities | 293,269 | 0
Total cash, cash equivalents, and marketable securities | 465,168 | 68,363
Accounts receivable | 215,827 | 199,720
Unbilled receivables | 207,155 | 180,219
Other current assets | 88,760 | 57,308
Total current assets | 976,910 | 505,610
Unbilled receivables | 113,278 | 121,736
Goodwill | 79,231 | 79,039
Other long-term assets | 434,843 | 278,427
Total assets | 1,604,262 | 984,812
Current liabilities: |  |
Accounts payable | 24,028 | 17,475
Accrued expenses | 59,261 | 48,001
Accrued compensation and related expenses | 123,012 | 104,126
Deferred revenue | 232,865 | 190,080
Other current liabilities | 20,969 | 18,273
Total current liabilities | 460,135 | 377,955
Convertible senior notes, net | 518,203 | 0
Operating lease liabilities | 59,053 | 52,610
Other long-term liabilities | 24,699 | 15,237
Total liabilities | 1,062,090 | 445,802
Commitments and Contingencies |  |
Stockholders’ equity: |  |
Preferred stock, $0.01 par value, 1,000 shares authorized; none issued | 0 | 0
Common stock, $0.01 par value, 200,000 shares authorized; 80,890 and 79,599 shares issued and outstanding at December 31, 2020 and 2019, respectively | 809 | 796
Additional paid-in capital | 204,432 | 140,523
Retained earnings | 339,879 | 410,919
Accumulated other comprehensive (loss) |  |
Net unrealized gain on available-for-sale marketable securities, net of tax | 46 | 0
Foreign currency translation adjustments | (2,994) | (13,228)
Total stockholders’ equity | 542,172 | 539,010
Total liabilities and stockholders’ equity | $ 1,604,262 | $ 984,812

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