Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 40,031	$ 68,840
Available-for-sale investments	25,232	14,755
Prepaid expenses and other current assets	1,345	1,006
Total current assets	66,608	84,601
Property and equipment, net	224	83
Other non-current assets	706	114
Total assets	67,538	84,798
Current liabilities:
Accounts payable	1,020	917
Accrued expenses	2,576	$ 1,421
Other current liabilities	537
Total current liabilities	4,133	$ 2,338
Total liabilities	$ 4,133	$ 2,338
Commitments and contingencies (Note 7)
Stockholders’ equity:
Preferred stock, $0.001 par value per share; 10,000,000 shares authorized, no shares issued and outstanding at December 31, 2015 and 2014
Common stock, $0.001 par value, 100,000,000 shares authorized at December 31, 2015 and 2014; 16,501,500 and 16,448,455 shares issued and outstanding at December 31, 2015 and 2014, respectively	$ 16	$ 16
Additional paid-in capital	194,651	192,324
Retained Earnings (Accumulated Deficit)	(131,251)	(109,874)
Accumulated other comprehensive loss	(11)	(6)
Total stockholders’ equity	63,405	82,460
Total liabilities and stockholders’ equity	$ 67,538	$ 84,798