Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 42,642	$ 13,844
Accounts receivable	140	918
Other current assets	1,119	180
Total current assets	43,901	14,942
Property and equipment, net	456	566
Deferred offering costs		2,744
Other assets	102	144
Restricted cash	294	294
Total assets	44,753	18,690
Current liabilities:
Accounts payable	3,741	3,330
Accrued expenses	3,057	2,248
Deferred revenue	4,326	4,076
Deferred rent	191	182
Total current liabilities	11,315	9,836
Deferred revenue, net of current portion	2,543	4,265
Deferred rent, net of current portion	191	287
Preferred stock warrant liability		110
Derivative liability	91	2
Total liabilities	14,140	14,500
Commitments and contingencies (Note 9)
Convertible preferred stock, (Series A and B), $0.001 par value; 0 and 110,057,398 shares authorized as of June 30, 2016 and December 31, 2015, respectively; 0 and 104,854,769 shares issued and outstanding as of June 30, 2016 and December 31, 2015, respectively; aggregate liquidation preference of $0 and $149,392, respectively, as of June 30, 2016 and December 31, 2015		112,292
Stockholders' equity (deficit):
Common stock, $0.001 par value; 125,000,000 and 170,000,000 shares authorized as of June 30, 2016 and December 31, 2015, respectively; 19,139,486 and 571,137 shares issued and outstanding as of June 30, 2016 and December 31, 2015, respectively	20	1
Additional paid-in capital	167,855	12,115
Accumulated deficit	(137,262)	(120,218)
Total stockholders' equity (deficit)	30,613	(108,102)
Total liabilities, convertible preferred stock and stockholders' equity (deficit)	$ 44,753	$ 18,690