Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 8,215	$ 19,145
Marketable securities	31,912	21,355
Prepaid expenses and other current assets	225	707
Total current assets	40,352	41,207
Property and equipment, net	5	3
Total assets	40,357	41,210
Current liabilities:
Accounts payable	2,780	762
Accrued expenses	3,126	4,038
Total current liabilities	5,906	4,800
Total liabilities	5,906	4,800
Stockholders' equity:
Preferred stock, par value $0.0001 per share authorized: 5,000,000 shares at March 31, 2017 and December 31, 2016; no shares issued and outstanding at each of March 31, 2017 and December 31, 2016
Common stock, par value $0.0001 per share authorized: 200,000,000 shares at March 31, 2017 and December 31, 2016, respectively; 12,167,405 and 11,951,866 shares issued and outstanding at March 31, 2017 and December 31, 2016, respectively	1	1
Additional paid-in-capital	115,692	111,691
Accumulated other comprehensive income	64	25
Accumulated deficit	(81,306)	(75,307)
Total stockholders' equity	34,451	36,410
Total liabilities and stockholders' equity	$ 40,357	$ 41,210