Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 15,294	$ 16,369
Short-term investments	22,276	0
Prepaid expenses and other current assets	1,345	1,094
Total current assets	38,915	17,463
Property and equipment, net	56	321
Restricted cash	113	113
Other assets	85
Total assets	39,169	17,897
Current liabilities:
Accounts payable	1,408	773
Accrued expenses	2,763	2,432
Current portion of notes payable, net of discount		2,479
Other liability		332
Total current liabilities	4,171	6,016
Deferred rent, net of current portion	9	89
Other liability	47
Total liabilities	4,227	6,105
Commitments (Note 9)
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; 7,141,996 and 2,364,526 shares issued and outstanding at December 31, 2018 and 2017, respectively	7	2
Additional paid-in capital	232,243	183,224
Accumulated other comprehensive loss	(4)
Accumulated deficit	(197,304)	(171,434)
Total stockholders' equity	34,942	11,792
Total liabilities and stockholders' equity	$ 39,169	$ 17,897