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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 683,287 | $ 278,820
Short-term investments | 1,816,257 | 1,805,252
Contracts receivable | 63,034 | 12,759
Inventories | 18,180 | 8,582
Other current assets | 139,839 | 102,473
Total current assets | 2,720,597 | 2,207,886
Property, plant and equipment, net | 153,651 | 132,160
Patents, net | 25,674 | 24,032
Long-term deferred tax assets | 305,557 | 290,796
Deposits and other assets | 27,633 | 12,910
Total assets | 3,233,112 | 2,667,784
Current liabilities: |  |
Accounts payable | 16,067 | 28,660
Accrued compensation | 37,357 | 29,268
Accrued liabilities | 66,769 | 47,503
Income taxes payable | 32,514 | 858
Current portion of long-term obligations | 2,026 | 13,749
Current portion of deferred contract revenue | 118,272 | 160,256
Total current liabilities | 273,005 | 280,294
Long-term deferred contract revenue | 490,060 | 567,359
Long-term obligations, less current portion | 15,543 | 4,914
Long-term mortgage debt | 59,913 | 59,842
Total liabilities | 1,548,565 | 1,480,624
Stockholders' equity: |  |
Common stock, $0.001 par value; 300,000,000 shares authorized, 140,339,615 and 137,928,828 shares issued and outstanding at December 31, 2019 and December 31, 2018, respectively | 140 | 138
Additional paid-in capital | 2,203,778 | 2,047,250
Accumulated other comprehensive loss | (25,290) | (32,016)
Accumulated deficit | (707,534) | (967,293)
Total Ionis stockholders' equity | 1,471,094 | 1,048,079
Noncontrolling interest in Akcea Therapeutics, Inc. | 213,453 | 139,081
Total stockholders' equity | 1,684,547 | 1,187,160
Total liabilities and stockholders' equity | 3,233,112 | 2,667,784
0.125 Percent Convertible Senior Notes [Member] |  |
Current liabilities: |  |
Convertible senior notes | 434,711 | 0
1 Percent Convertible Senior Notes [Member] |  |
Current liabilities: |  |
Convertible senior notes | $ 275,333 | $ 568,215

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