Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 370,829	$ 599,691
Short-term investments	803,083	479,369
Accounts receivable, net	49,044	29,468
Inventory	125,445	83,605
Other current assets	77,782	36,511
Total Current Assets	1,426,183	1,228,644
Property and equipment, net of accumulated depreciation of $28,149 and $18,022 as of December 31, 2018 and 2017, respectively	97,024	43,156
Intangible assets, net of accumulated amortization of $3,852 and $4,145 as of December 31, 2018 and 2017, respectively	11,574	14,355
Investments and other assets	107,294	21,809
Total Assets	1,642,075	1,307,964
Current Liabilities:
Accounts payable	33,829	8,467
Accrued expenses	134,095	68,982
Current portion of long-term debt		6,175
Deferred revenue	3,303	3,316
Other current liabilities	2,463	1,392
Total Current Liabilities	173,690	88,332
Long-term debt	420,554	424,876
Deferred rent and other	15,555	5,539
Total Liabilities	609,799	518,747
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; 71,071,887 and 64,791,670 issued and outstanding at December 31, 2018 and 2017, respectively	7	6
Additional paid-in capital	2,611,294	2,006,598
Accumulated other comprehensive loss	(99)	(379)
Accumulated deficit	(1,578,926)	(1,217,008)
Total Stockholders’ Equity	1,032,276	789,217
Total Liabilities and Stockholders’ Equity	$ 1,642,075	$ 1,307,964