Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 161,705	$ 77,491
Marketable securities	1,023,512	347,224
Accounts receivable, net	41,916	26,419
Inventory, net	38,617	26,027
Prepaid expenses and other current assets	23,832	10,055
Total current assets	1,289,582	487,216
Long-term Assets:
Property, plant and equipment, net	188,486	79,986
Intangibles, net	22,493	24,205
Other long-term assets, net	9,015	7,153
Total assets	1,509,576	598,560
Current Liabilities:
Accounts payable	32,738	16,135
Accrued liabilities	68,938	49,126
Accrued interest	1,901
Debt, current portion		182
Other short-term liabilities	3,158	2,681
Total current liabilities	106,735	68,124
Convertible notes, net	656,341
Long-term debt, less current portion	17,080	4,269
Other long-term liabilities	12,691	5,749
Total liabilities	792,847	78,142
Commitments and contingencies
Stockholders' Equity:
Preferred stock, $0.01 par value Authorized—5,000,000 shares issued and outstanding—no shares at September 30, 2018 and December 31, 2017
Common stock, $0.01 par value Authorized—200,000,000 shares issued and outstanding—122,889,854 and 120,497,426 shares at September 30, 2018 and December 31, 2017	1,229	1,205
Additional paid-in capital	1,698,695	1,380,577
Accumulated other comprehensive loss	(1,406)	(750)
Accumulated deficit	(981,789)	(860,614)
Total stockholders' equity	716,729	520,418
Total liabilities and stockholders’ equity	$ 1,509,576	$ 598,560