BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 37,530	$ 26,178
Short-term investments	5,435	3,922
Prepaid expenses and other current assets	582	199
Total current assets	43,547	30,299
Property and equipment, net	1,172	1,148
Investments	19,938
Total assets	64,657	31,447
Current liabilities:
Accounts payable	634	2,809
Accrued expenses	1,796	1,775
Current portion of notes payable		3,500
Total current liabilities	2,430	8,084
Notes payable		1,743
Other long-term liabilities	127	141
Total liabilities	2,557	9,968
Stockholders' equity:
Preferred stock, $0.001 par value; 25,000,000 shares authorized, no shares issued and outstanding
Common stock, $0.001 par value; 100,000,000 shares authorized, 40,459,427 issued and 40,430,196 outstanding at September 30, 2017 and 19,734,351 issued and 19,705,120 outstanding at December 31, 2016	40	20
Additional paid-in capital	202,067	147,288
Treasury stock at cost, 29,231 shares at September 30, 2017 and December 31, 2016
Accumulated other comprehensive loss	(18)
Accumulated deficit	(139,989)	(125,829)
Total stockholders’ equity	62,100	21,479
Total liabilities and stockholders’ equity	$ 64,657	$ 31,447