Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 25,024	$ 31,213
Short-term investments	80,253	88,914
Restricted cash	50	50
Prepaid and other current assets	3,675	3,814
Total current assets	109,002	123,991
Other assets, noncurrent	197	543
Right-of-use assets	2,315
Property and equipment, net	356	386
Total assets	111,870	124,920
Current liabilities:
Accounts payable	282	1,248
Accrued compensation	876	1,495
Other accrued liabilities	2,762	2,043
Deferred rent, current portion		15
Operating lease liability	450
Total current liabilities	4,370	4,801
Operating lease liability, noncurrent	1,686
Deferred rent, noncurrent portion		174
Total liabilities	6,056	4,975
Stockholders’ equity:
Preferred stock, $0.001 par value, 5,000,000 shares authorized; zero shares issued and outstanding
Common stock, $0.001 par value, 100,000,000 shares authorized; 11,974,104 and 11,954,528 shares issued and outstanding at March 31, 2019 and December 31, 2018, respectively	12	12
Additional paid-in capital	324,214	323,279
Accumulated other comprehensive income (loss)	13	(4)
Accumulated deficit	(218,425)	(203,342)
Total stockholders’ equity	105,814	119,945
Total liabilities and stockholders’ equity	$ 111,870	$ 124,920