Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 9,899	$ 15,294
Short-term investments	26,345	22,276
Prepaid expenses and other current assets	2,714	1,345
Total current assets	38,958	38,915
Right-of-use asset	2,349
Other assets	473	254
Total assets	41,780	39,169
Current liabilities:
Accounts payable	1,197	1,408
Accrued expenses	2,610	2,763
Current portion of operating lease liabilities	1,225
Total current liabilities	5,032	4,171
Other long-term liabilities		56
Long-term portion of operating lease liabilities	1,028
Total liabilities	6,060	4,227
Commitments (Note 6)
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; 12,433,600 and 7,141,996 shares issued and outstanding at December 31, 2019 and December 31, 2018, respectively	12	7
Additional paid-in capital	259,305	232,243
Accumulated other comprehensive loss		(4)
Accumulated deficit	(223,597)	(197,304)
Total stockholders' equity	35,720	34,942
Total liabilities and stockholders' equity	$ 41,780	$ 39,169