CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 32,606	$ 47,441
Short-term investments	29,875	0
Accounts receivable	24	1,456
Prepaid expenses and other current assets	2,865	2,971
Total current assets	65,370	51,868
Property and equipment, net	727	563
Other assets	50	50
Total assets	66,147	52,481
Current liabilities:
Accounts payable	571	906
Accrued liabilities	3,868	2,991
Current portion of note payable	2,294	0
Total current liabilities	6,733	3,897
Note payable, net of current portion	8,004	9,922
Other liabilities	66	152
Total liabilities	14,803	13,971
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.01 par value; 100,000,000 shares authorized; 30,839,463 and 22,568,006 shares issued and outstanding at December 31, 2018 and 2017, respectively	308	226
Additional paid-in capital	177,335	131,877
Accumulated other comprehensive loss	(3)	0
Accumulated deficit	(126,296)	(93,593)
Total stockholders’ equity	51,344	38,510
Total liabilities and stockholders’ equity	$ 66,147	$ 52,481