Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 647,315	$ 230,146
Accounts receivable	3,214	679
Inventories	12,163	1,106
Other current assets	7,409	4,560
Total current assets	670,101	236,491
Intangible assets, net	13,341	14,732
Property and equipment, net	3,781	2,779
Restricted cash	620	500
Other assets	1,751	779
Total assets	689,594	255,281
Current liabilities:
Accounts payable	3,264	8,019
Accrued expenses	53,135	36,628
Deferred revenue, current	772	500
Other current liabilities	670	1,534
Total current liabilities	57,841	46,681
Convertible notes, net	129,017	121,325
Deferred revenue, non-current		288
Other non-current liabilities	515	113
Total liabilities	187,373	168,407
Commitments and contingencies (Note 10)
Stockholders' equity:
Preferred stock, $0.0001 par value; 10,000,000 shares authorized at both December 31, 2015 and June 30, 2016; no shares issued or outstanding at both December 31, 2015 and June 30, 2016
Common stock, $0.0001 par value; 100,000,000 shares authorized at both December 31, 2015 and September 30, 2016; 40,279,783 and 51,656,692 shares issued and outstanding at December 31, 2015 and September 30, 2016, respectively	5	4
Additional paid-in capital	1,356,040	688,788
Accumulated other comprehensive loss	(98)
Accumulated deficit	(853,726)	(601,918)
Total stockholders' equity	502,221	86,874
Total liabilities and stockholders' equity	$ 689,594	$ 255,281