Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 476,812	$ 643,095
Accounts receivable	31,362	53,416
Inventories	108,822	57,939
Other current assets	31,382	33,511
Total current assets	648,378	787,961
Intangible assets, net	35,897	56,384
Property and equipment, net	9,923	9,652
Restricted cash	8,610	2,552
Other assets	8,032	5,636
Total assets	710,840	862,185
Current liabilities:
Accounts payable	28,160	4,172
Accrued expenses	150,933	154,808
Deferred revenue, current	530	324
Other current liabilities	10,819	6,902
Total current liabilities	190,442	166,206
Convertible notes, net	153,057	143,446
Long-term debt, net	490,525	293,659
Deferred revenue, non-current	141	211
Other non-current liabilities	7,467	9,577
Total liabilities	841,632	613,099
Commitments and contingencies (Note 11)
Stockholders' equity (deficit):
Preferred stock, $0.0001 par value; 10,000,000 shares authorized at both September 30, 2018 and December 31, 2017; no shares issued or outstanding at both September 30, 2018 and December 31, 2017
Common stock, $0.0001 par value; 100,000,000 shares authorized at both September 30, 2018 and December 31, 2017; 55,034,990 and 54,464,039 shares issued and outstanding at September 30, 2018 and December 31, 2017, respectively	5	5
Additional paid-in capital	1,813,884	1,724,850
Accumulated other comprehensive loss	(8,239)	(5,882)
Accumulated deficit	(1,936,442)	(1,469,887)
Total stockholders' equity (deficit)	(130,792)	249,086
Total liabilities and stockholders' equity (deficit)	$ 710,840	$ 862,185