Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current Assets:
Cash and cash equivalents	$ 205,058	$ 160,430
Marketable securities	1,034,364	963,752
Accounts receivable, net	63,903	45,329
Inventory, net	47,781	39,148
Prepaid expenses and other current assets	23,690	19,408
Total current assets	1,374,796	1,228,067
Long-term Assets:
Property, plant and equipment, net	335,499	245,259
Goodwill and intangibles, net	45,046	46,281
Other long-term assets, net	26,602	4,415
Total assets	1,781,943	1,524,022
Current Liabilities:
Accounts payable	19,896	28,141
Accrued liabilities	151,009	100,644
Accrued interest	2,870	4,172
Convertible notes, net, current portion	311,598
Debt, current portion	415	8
Other short-term liabilities	6,675	3,204
Total current liabilities	492,463	136,169
Long-term convertible notes, net, less current portion	469,595	664,749
Long-term debt, less current portion	24,429	24,494
Other long-term liabilities	29,924	17,669
Total liabilities	1,016,411	843,081
Commitments and contingencies
Stockholders' Equity:
Preferred stock, $0.01 par value Authorized-5,000,000 shares issued and outstanding-no shares at June 30, 2019 and December 31, 2018
Common stock, $0.01 par value Authorized-200,000,000 shares issued and outstanding-129,361,048 and 123,192,540 shares at June 30, 2019 and December 31, 2018	1,295	1,232
Additional paid-in capital	1,919,719	1,716,894
Accumulated other comprehensive income (loss)	1,760	(1,422)
Accumulated deficit	(1,157,242)	(1,035,763)
Total stockholders' equity	765,532	680,941
Total liabilities and stockholders' equity	$ 1,781,943	$ 1,524,022