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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 1,163,980 | $ 899,509
Marketable securities—available-for-sale | 274,343 | 270,136
Accounts receivable | 307,598 | 266,299
Inventory | 6,967 | 6,482
Prepaid expenses and other current assets | 79,366 | 62,428
Total current assets | 1,832,254 | 1,504,854
Restricted cash and investments | 1,006 | 925
Long term investments | 99,199 | 134,356
Inventory | 3,438 | 7,966
Property and equipment, net | 319,751 | 259,763
Other intangible assets, net | 215,364 | 236,901
Goodwill | 155,593 | 155,593
Other assets, net | 19,157 | 2,224
Total assets | 2,645,762 | 2,302,582
Current liabilities: |  |
Accounts payable | 103,827 | 67,671
Accrued compensation | 60,176 | 74,550
Interest payable | 29 | 33
Accrued and other current liabilities | 229,401 | 198,901
Convertible senior notes |  | 7,393
Acquisition-related contingent consideration | 31,844 | 26,848
Total current liabilities | 425,277 | 375,396
Convertible senior notes | 17,434 | 16,608
Acquisition-related contingent consideration | 255,157 | 260,152
Other liabilities | 21,927 | 19,797
Total liabilities | 719,795 | 671,953
Stockholders' equity: |  |
Preferred stock, $0.001 par value; 5,000,000 shares authorized; none issued or outstanding as of December 31, 2018 and December 31, 2017 |  |
Common stock, $0.001 par value; 400,000,000 shares authorized; 213,274,660 and 211,262,906 shares issued and outstanding as of December 31, 2018 and December 31, 2017, respectively | 213 | 211
Additional paid-in capital | 3,813,678 | 3,627,433
Accumulated other comprehensive loss | (10,165) | (7,010)
Accumulated deficit | (1,877,759) | (1,990,005)
Total stockholders' equity | 1,925,967 | 1,630,629
Total liabilities and stockholders' equity | $ 2,645,762 | $ 2,302,582

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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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(14)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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