Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 135,110	$ 258,567
Restricted cash	47	47
Marketable securities	79,606	73,880
Trade receivables, net	1,211	0
Inventory	1,636	0
Prepaid expenses and other current assets	5,940	2,315
Total current assets	223,550	334,809
Property and equipment, net	6,738	4,922
Intangible assets	8,579	0
Other assets	558	551
Total assets	239,425	340,282
Current liabilities:
Accounts payable	4,396	6,128
Accrued expenses and other current liabilities	27,378	26,597
Total current liabilities	31,774	32,725
Other non-current liabilities	331	379
Total liabilities	32,105	33,104
Commitments and contingencies
Stockholders’ equity:
Common stock, $.0001 par value; 200,000,000 shares authorized, 43,502,335 shares and 43,141,134 shares issued and outstanding at June 30, 2017 and December 31, 2016, respectively	4	4
Additional paid-in-capital	960,736	935,671
Accumulated other comprehensive income	3	71
Accumulated deficit	(753,423)	(628,568)
Total stockholders’ equity	207,320	307,178
Total liabilities and stockholders’ equity	$ 239,425	$ 340,282