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UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 172,708 | $ 171,899
Marketable securities | 269,650 | 293,269
Total cash, cash equivalents, and marketable securities | 442,358 | 465,168
Accounts receivable | 159,324 | 215,827
Unbilled receivables | 228,603 | 207,155
Other current assets | 91,868 | 88,760
Total current assets | 922,153 | 976,910
Unbilled receivables | 108,048 | 113,278
Goodwill | 82,037 | 79,231
Other long-term assets | 416,265 | 434,843
Total assets | 1,528,503 | 1,604,262
Current liabilities: |  |
Accounts payable | 24,426 | 24,028
Accrued expenses | 59,765 | 59,261
Accrued compensation and related expenses | 59,490 | 123,012
Deferred revenue | 244,170 | 232,865
Other current liabilities | 16,599 | 20,969
Total current liabilities | 404,450 | 460,135
Convertible senior notes, net | 588,418 | 518,203
Operating lease liabilities | 36,471 | 59,053
Other long-term liabilities | 20,239 | 24,699
Total liabilities | 1,049,578 | 1,062,090
Stockholders’ equity: |  |
Preferred stock, 1,000 shares authorized; none issued | 0 | 0
Common stock, 200,000 shares authorized; 81,246 and 80,890 shares issued and outstanding at March 31, 2021 and December 31, 2020, respectively | 812 | 809
Additional paid-in capital | 140,558 | 204,432
Retained earnings | 340,223 | 339,879
Accumulated other comprehensive (loss) | (2,668) | (2,948)
Total stockholders’ equity | 478,925 | 542,172
Total liabilities and stockholders’ equity | $ 1,528,503 | $ 1,604,262

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