CONDENSED BALANCE SHEETS (unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 51,894	$ 61,031
Restricted cash	20	20
Other receivable	670	233
Prepaid expenses and other assets	1,491	1,344
Total current assets	54,075	62,628
Property and equipment, net	380	355
Operating lease right-of-use assets	1,899
Other assets	32	43
Total assets	56,386	63,026
Current liabilities:
Current portion of long-term debt	423
Accounts payable	2,058	1,806
Accrued expenses and other current liabilities	1,316	2,771
Total current liabilities	3,797	4,577
Long-term debt	6,841	7,500
Operating lease liabilities	1,666
Deferred rent		22
Total liabilities	12,304	12,099
Commitments and contingencies (Note 7)
Stockholders’ equity:
Preferred stock, $0.001 par value; 10,000,000 shares authorized at March 31, 2019 and December 31, 2018; zero shares issued and outstanding at March 31, 2019 and December 31, 2018
Common stock, $0.001 par value; 200,000,000 shares authorized; 24,528,392 shares issued and 24,498,425 shares outstanding at March 31, 2019; 24,528,242 shares issued and 24,498,275 shares outstanding at December 31, 2018	25	25
Treasury stock, at cost, 29,967 shares as of March 31, 2019 and December 31, 2018	(24)	(24)
Additional paid-in capital	174,285	173,837
Accumulated deficit	(130,204)	(122,911)
Total stockholders’ equity	44,082	50,927
Total liabilities and stockholders' equity	$ 56,386	$ 63,026