CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 90,943	$ 67,727
Short-term investments	739	4,998
Prepaid expenses and other current assets	2,452	1,215
Total current assets	94,134	73,940
Property and equipment, net	2,265	1,294
Other assets	2,443
Total assets	98,842	75,234
Current liabilities:
Accounts payable	2,763	2,472
Accrued expenses	5,268	4,437
Total current liabilities	8,031	6,909
Other long-term liabilities	3,042
Total liabilities	11,073	6,909
Series A convertible preferred stock, $0.001 par value; 25,000,000 shares authorized, 30,000 and 0 shares issued and outstanding at December 31, 2019 and 2018	28,200
Commitments and contingencies (Note 10)
Stockholders’ equity:
Common stock, $0.001 par value; 100,000,000 shares authorized, 86,500,353 issued and 86,471,122 outstanding at December 31, 2019 and 52,548,244 issued and 52,519,013 outstanding at December 31, 2018	87	53
Additional paid-in capital	295,056	249,727
Treasury stock at cost, 29,231 shares at December 31, 2019 and 2018
Accumulated other comprehensive income (loss)		(2)
Accumulated deficit	(235,574)	(181,453)
Total stockholders’ equity	59,569	68,325
Total liabilities and stockholders’ equity	$ 98,842	$ 75,234