Condensed Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 112,044	$ 34,435
Accounts receivable	2,660	6,436
Prepaid expenses and other current assets	1,669	965
Total current assets	116,373	41,836
Property and equipment, net	1,152	530
Other assets		358
Restricted cash	204	180
Total assets	117,729	42,904
Current liabilities:
Accounts payable	1,022	2,284
Accrued compensation and benefits	1,106	927
Other accrued liabilities	789	95
Deferred rent		5
Deferred revenue, current portion	16,480	13,828
Total current liabilities	19,397	17,139
Deferred revenue, non-current	34,959	26,470
Convertible preferred stock warrant liability		6,456
Liabilities related to early exercise of options	72	163
Total liabilities	54,428	50,228
Commitments and contingencies
Convertible preferred stock, $0.0001 par value per share — no shares and 108,829,748 shares authorized as of September 30, 2014 and December 31, 2013, respectively; no shares and 11,517,222 shares issued and outstanding as of September 30, 2014 and December 31, 2013, respectively		56,155
Stockholders’ equity (deficit):
Preferred stock, $0.0001 par value; 5,000,000 shares and no shares authorized as of September 30, 2014 and December 31, 2013, respectively; no shares issued and outstanding as of September 30, 2014 and December 31, 2013, respectively
Common stock, $0.0001 par value — 300,000,000 and 130,360,121 shares authorized as of September 30, 2014 and December 31, 2013, respectively; 18,399,761 and 1,225,481 shares issued and outstanding as of September 30, 2014 and December 31, 2013, respectively	2
Additional paid-in capital	131,195	5,174
Accumulated deficit	(67,896)	(68,653)
Total stockholders’ equity (deficit)	63,301	(63,479)
Total liabilities, convertible preferred stock, and stockholders’ equity (deficit)	$ 117,729	$ 42,904