Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 120,490	$ 75,354
Accounts receivable	3,143	1,970
Inventory	307	25
Prepaid expenses	1,425	633
Total current assets	125,365	77,982
Property and equipment, net	532	401
Total assets	125,897	78,383
Current liabilities:
Accounts payable	2,679	6,903
Accrued liabilities	3,948	5,001
Deferred rent, current	52	43
Total current liabilities	6,679	11,947
Other noncurrent liabilities	$ 49	$ 90
Commitments and contingencies (Note 7)
Stockholders’ equity:
Common stock, $0.001 par value; 100,000,000 shares authorized at September 30, 2015 (unaudited) and December 31, 2014; 20,142,715 and 16,878,817 shares issued and outstanding at September 30, 2015 (unaudited) and December 31, 2014, respectively	$ 20	$ 17
Preferred stock, $0.001 par value; 10,000,000 shares authorized; no shares issued or outstanding	0	0
Additional paid-in capital	237,242	157,092
Accumulated deficit	(118,093)	(90,763)
Total stockholders’ equity	119,169	66,346
Total liabilities, preferred stock and stockholders’ equity	$ 125,897	$ 78,383