CONSOLIDATED BALANCE SHEETS - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 24,846,000	$ 32,606,000
Short-term investments	1,999,000	29,875,000
Accounts receivable	108,000	24,000
Prepaid expenses and other current assets	2,786,000	2,865,000
Total current assets	29,739,000	65,370,000
Property and equipment, net	523,000	727,000
Other assets	0	50,000
Total assets	30,262,000	66,147,000
Current liabilities:
Accounts payable	1,096,000	571,000
Accrued liabilities	5,108,000	3,868,000
Current portion of note payable	3,976,000	2,294,000
Total current liabilities	10,180,000	6,733,000
Note payable, net of current portion	4,328,000	8,004,000
Other liabilities	0	66,000
Total liabilities	14,508,000	14,803,000
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.01 par value; 100,000,000 shares authorized; 34,861,876 and 30,839,463 shares issued and outstanding at December 31, 2019 and 2018, respectively	349,000	308,000
Additional paid-in capital	183,574,000	177,335,000
Accumulated other comprehensive loss	0	(3,000)
Accumulated deficit	(168,169,000)	(126,296,000)
Total stockholders’ equity	15,754,000	51,344,000
Total liabilities and stockholders’ equity	$ 30,262,000	$ 66,147,000