Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents, fair value	$ 48,201	$ 36,641
Marketable securities	77,386	137,777
Prepaid expenses and other current assets	2,604	4,368
Total Current Assets	128,191	178,786
Property, Plant and Equipment, Net	10,558	7,893
Deposits and other non-current assets	1,206	1,527
Marketable securities	960	1,360
Total Assets	140,915	189,566
Current liabilities:
Accounts Payable	911	550
Accrued expenses	10,493	6,488
Deferred revenue, current portion	9,537	6,764
Total current liabilities	20,941	13,802
Deferred rent, net of current portion	5,385	4,999
Deferred revenue, net of current portion	28,368	34,818
Other non-current liabilities	1,015	25
Total Liabilities	55,709	53,644
Stockholders’ equity:
Common stock, $0.001 par value: 120,000,000 shares authorized at September 30, 2017 and December 31, 2016; 26,250,327 and 25,597,912 shares issued and outstanding at September 30, 2017 and December 31, 2016, respectively	26	26
Additional paid-in capital	234,519	225,963
Accumulated other comprehensive gain	(455)	(52)
Accumulated deficit	(148,884)	(90,015)
Total stockholders’ deficit	85,206	135,922
Total liabilities and stockholders’ equity	$ 140,915	$ 189,566