Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 13,203	$ 16,660
Restricted cash	4	4
Prepaid expenses and other current assets	1,118	461
Total current assets	14,325	17,125
Property, equipment and leasehold improvements, net	89	100
Restricted cash - non current	110	110
Operating lease right-of-use assets	1,410
Other assets	1,037	1,042
Total assets	16,971	18,377
Current liabilities:
Accounts payable	988	815
Loan payable, current portion		100
Operating lease liabilities	208
Accrued expenses	893	1,290
Total current liabilities	2,089	2,205
Other liabilities	62	61
Operating lease liabilities - non current	1,276
Total liabilities	3,427	2,266
Commitments and contingencies (Note 5)
Stockholders’ equity:
Common stock, $0.00001 par value, authorized 25,000,000 shares; 9,311,070 shares issued and outstanding at March 31, 2019; 9,309,255 shares issued and outstanding at December 31, 2018	1	1
Additional paid-in capital	223,508	223,440
Accumulated deficit	(209,965)	(207,330)
Total stockholders’ equity	13,544	16,111
Total liabilities and stockholders’ equity	$ 16,971	$ 18,377