Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 835,080	$ 370,829
Short-term investments	289,668	803,083
Accounts receivable	90,879	49,044
Inventory	171,379	125,445
Other current assets	81,907	77,782
Total current assets	1,468,913	1,426,183
Property and equipment, net	129,620	97,024
Intangible assets, net	12,497	11,574
Right of use assets, net	37,933
Other non-current assets	173,859	107,294
Total assets	1,822,822	1,642,075
Current liabilities:
Accounts payable	68,094	33,829
Accrued expenses	185,527	134,095
Other current liabilities	11,146	5,766
Total current liabilities	264,767	173,690
Long-term debt	681,900	420,554
Lease liabilities	47,720
Other non-current liabilities	10,248	15,555
Total liabilities	1,004,635	609,799
Commitments and contingencies (Note 21)
Stockholders’ equity:
Preferred stock, $.0001 par value, 3,333,333 shares authorized; none issued and outstanding
Common stock, $.0001 par value, 99,000,000 shares authorized; 75,184,863 and 71,071,887 issued and outstanding at December 31, 2019 and 2018, respectively	8	7
Additional paid-in capital	3,112,130	2,611,294
Accumulated other comprehensive income (loss), net of tax	50	(99)
Accumulated deficit	(2,294,001)	(1,578,926)
Total stockholders’ equity	818,187	1,032,276
Total liabilities and stockholders’ equity	$ 1,822,822	$ 1,642,075