Condensed Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 16,276	$ 33,633
Short-term investments	70,671	63,651
Accounts receivable, net	14	108
Prepaid and other current assets	2,093	2,677
Total current assets	89,054	100,069
Restricted cash	698	696
Property and equipment, net	3,883	3,996
Right-of-use assets	16,421	0
Other long-term assets	231	231
Total assets	110,287	104,992
Current liabilities:
Accounts payable	1,152	1,029
Accrued expenses	4,177	3,788
Accrued compensation	1,243	2,635
Leases, current	3,245	0
Deferred rent, current	0	38
Total current liabilities	9,817	7,490
Long-term debt, net	14,822	14,764
Leases, net of current	16,359	0
Deferred rent, net of current	0	3,001
Total liabilities	40,998	25,255
Commitments and Contingencies	0	0
Stockholders' equity:
Preferred stock, $0.001 par value; 10,000,000 shares authorized at March 31, 2019 and December 31, 2018; no shares issued or outstanding at March 31, 2019 and December 31, 2018	0	0
Common stock, $0.001 par value; 200,000,000 shares authorized at March 31, 2019 and December 31, 2018; 30,685,412 and 30,685,412 shares issued and outstanding at March 31, 2019 and December 31, 2018, respectively	31	31
Additional paid-in capital	496,443	494,947
Accumulated other comprehensive income (loss)	17	(23)
Accumulated deficit	(427,202)	(415,218)
Total stockholders' equity	69,289	79,737
Total liabilities and stockholders' equity	$ 110,287	$ 104,992