Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Assets, Current
Cash and cash equivalents, fair value	$ 63,507	$ 31,309
Marketable securities	127,646	163,028
Prepaid Expense and Other Assets, Current	1,868	1,557
Total Current Assets	193,021	195,894
Property, Plant and Equipment, Net	4,253	3,234
Deposits and other non-current assets	2,294	321
Marketable securities	2,416	30,008
Total Assets	201,984	229,457
Liabilities, Current
Accounts Payable	787	612
Accrued expenses	6,304	3,430
Deferred rent, current portion		300
Deferred revenue, current portion	12,296	19,589
Total current liabilities	19,387	23,931
Deferred rent, net of current portion	1,988	1,015
Deferred revenue, net of current portion	31,456	35,393
Other non-current liabilities	29	44
Total Liabilities	52,860	60,383
Stockholders' Equity Attributable to Parent
Common stock, $0.001 par value: 120,000,000 shares authorized at September 30, 2016 and December 31, 2015; 25,419,245 and 24,930,979 shares issued and outstanding at September 30, 2016 and December 31, 2015, respectively	25	25
Additional Paid in Capital	223,811	219,122
Accumulated other comprehensive gain	630	(251)
Accumulated deficit	(75,342)	(49,822)
Total stockholders’ deficit	149,124	169,074
Total liabilities, redeemable convertible preferred stock and stockholders’ deficit	$ 201,984	$ 229,457