Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 19,876	$ 16,369
Short-term investments	23,363	0
Prepaid expenses and other current assets	1,302	1,094
Total current assets	44,541	17,463
Property and equipment, net	45	321
Restricted cash	113	113
Total assets	44,699	17,897
Current liabilities:
Accounts payable	1,047	773
Accrued expenses	2,730	2,432
Current portion of notes payable, net of discount		2,479
Other liability	348	332
Total current liabilities	4,125	6,016
Deferred rent, net of current portion	55	89
Total liabilities	4,180	6,105
Commitments (Note 7)
Stockholders' equity:
Preferred stock, $0.001 par value per share, 5,000,000 shares authorized and no shares issued and outstanding
Common stock, $0.001 par value per share, 150,000,000 shares authorized; 71,038,419 and 23,645,247 shares issued and outstanding at September 30, 2018 and December 31, 2017, respectively	71	24
Additional paid-in capital	231,697	183,202
Accumulated other comprehensive loss	(5)
Accumulated deficit	(191,244)	(171,434)
Total stockholders' equity	40,519	11,792
Total liabilities and stockholders' equity	$ 44,699	$ 17,897