CONDENSED BALANCE SHEETS (unaudited) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 90,342	$ 61,031
Restricted cash		20
Other receivable	1,180	233
Prepaid expenses and other assets	3,375	1,344
Total current assets	94,897	62,628
Property and equipment, net	677	355
Operating lease right-of-use assets	1,832
Other assets	32	43
Total assets	97,438	63,026
Current liabilities:
Current portion of long-term debt	1,265
Accounts payable	3,047	1,806
Accrued expenses and other current liabilities	1,434	2,771
Total current liabilities	5,746	4,577
Long-term debt	8,429	7,500
Operating lease liabilities	1,598
Other long-term liabilities	56
Deferred rent		22
Total liabilities	15,829	12,099
Commitments and contingencies (Note 7)
Stockholders’ equity:
Preferred stock, $0.001 par value; 10,000,000 shares authorized at June 30, 2019 and December 31, 2018; zero shares issued and outstanding at June 30, 2019 and December 31, 2018
Common stock, $0.001 par value; 200,000,000 shares authorized; 28,727,607 shares issued and 28,697,640 shares outstanding at June 30, 2019; 24,528,242 shares issued and 24,498,275 shares outstanding at December 31, 2018	29	25
Treasury stock, at cost, 29,967 shares as of June 30, 2019 and December 31, 2018	(24)	(24)
Additional paid-in capital	221,040	173,837
Accumulated deficit	(139,436)	(122,911)
Total stockholders’ equity	81,609	50,927
Total liabilities and stockholders' equity	$ 97,438	$ 63,026