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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | [1]
--- | --- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 1,299,704 | $ 1,163,980
Marketable securities—available-for-sale | 281,320 | 274,343
Accounts receivable | 244,081 | 307,598
Inventory | 7,129 | 6,967
Prepaid expenses and other current assets | 72,266 | 79,366
Total current assets | 1,904,500 | 1,832,254
Restricted cash and investments | 995 | 1,006
Long term investments | 120,188 | 99,199
Inventory | 3,876 | 3,438
Property and equipment, net | 338,331 | 319,751
Other intangible assets, net | 209,980 | 215,364
Goodwill | 155,593 | 155,593
Other assets, net | 20,698 | 19,157
Total assets | 2,754,161 | 2,645,762
Current liabilities: |  |
Accounts payable | 70,363 | 103,827
Accrued compensation | 48,522 | 60,176
Interest payable | 89 | 29
Accrued and other current liabilities | 211,302 | 229,401
Acquisition-related contingent consideration | 34,239 | 31,844
Total current liabilities | 364,515 | 425,277
Convertible senior notes | 17,647 | 17,434
Acquisition-related contingent consideration | 252,761 | 255,157
Other liabilities | 33,671 | 21,927
Total liabilities | 668,594 | 719,795
Stockholders' equity: |  |
Preferred stock, $0.001 par value; 5,000,000 shares authorized; none issued or outstanding as of March 31, 2019 and December 31, 2018 |  |
Common stock, $0.001 par value; 400,000,000 shares authorized; 214,320,605 and 213,274,660 shares issued and outstanding as of March 31, 2019 and December 31, 2018, respectively | 214 | 213
Additional paid-in capital | 3,869,952 | 3,813,678
Accumulated other comprehensive loss | (9,247) | (10,165)
Accumulated deficit | (1,775,352) | (1,877,759)
Total stockholders' equity | 2,085,567 | 1,925,967
Total liabilities and stockholders' equity | $ 2,754,161 | $ 2,645,762
[1] | The condensed consolidated balance sheet at December 31, 2018 has been derived from the audited financial statements at that date.

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- Definition Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(7)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(8)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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