Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 1,764,212	$ 835,080
Short-term investments	406,940	289,668
Accounts receivable	106,875	90,879
Inventory	173,168	171,379
Other current assets	96,153	81,907
Total current assets	2,547,348	1,468,913
Property and equipment, net	137,325	129,620
Intangible assets, net	12,813	12,497
Right of use assets	63,097	37,933
Other non-current assets	186,805	173,859
Total assets	2,947,388	1,822,822
Current liabilities:
Accounts payable	26,595	68,094
Accrued expenses	176,298	185,527
Deferred revenue, current portion	91,073	3,303
Other current liabilities	12,463	7,843
Total current liabilities	306,429	264,767
Long-term debt	687,953	681,900
Lease liabilities	65,263	47,720
Deferred revenue, net of current portion	732,667
Other non-current liabilities	10,248	10,248
Total liabilities	1,802,560	1,004,635
Commitments and contingencies (Note 15)
Stockholders’ equity:
Preferred stock, $0.0001 par value, 3,333,333 shares authorized; none issued and outstanding
Common stock, $0.0001 par value, 99,000,000 shares authorized; 77,957,790 and 75,184,863 issued and outstanding at March 31, 2020, and December 31, 2019, respectively	8	8
Additional paid-in capital	3,455,689	3,112,130
Accumulated other comprehensive income, net of tax	624	50
Accumulated deficit	(2,311,493)	(2,294,001)
Total stockholders’ equity	1,144,828	818,187
Total liabilities and stockholders’ equity	$ 2,947,388	$ 1,822,822