Condensed Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 70,889	$ 33,774
Marketable securities		57,699
Prepaid expenses and other current assets	2,860	1,780
Total current assets	73,749	93,253
Restricted cash	245	245
Property and equipment, net	348	414
Total assets	74,342	93,912
Current liabilities:
Accounts payable	2,467	6,716
Accrued liabilities	1,097	5,483
Total current liabilities	3,564	12,199
Other liabilities	34	15
Total liabilities	3,598	12,214
Commitments and contingencies (see Note 10)
Stockholders’ equity:
Preferred stock, $0.0001 par value, 10,000,000 shares authorized as of June 30, 2020 and December 31, 2019; none issued and outstanding as of June 30, 2020 and December 31, 2019
Common stock, $0.0001 par value, 150,000,000 shares authorized as of June 30, 2020 and December 31, 2019; 36,446,853 and 36,444,732 shares issued and outstanding as of June 30, 2020 and December 31, 2019, respectively	4	4
Additional paid-in capital	237,509	235,777
Accumulated deficit	(166,769)	(154,132)
Accumulated other comprehensive income		49
Total stockholders’ equity	70,744	81,698
Total liabilities and stockholders’ equity	$ 74,342	$ 93,912