CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 19,955	$ 22,383
Short-term investments	67,883	34,351
Other current assets	4,439	2,821
Total current assets	92,277	59,555
Property and equipment, net	618	629
Other long-term assets	2,089	3,260
Total assets	94,984	63,444
Current liabilities
Accounts payable and accrued liabilities	11,737	15,002
Total current liabilities	11,737	15,002
Other liability	280	133
Total liabilities	12,017	15,135
Stockholders’ equity
Preferred stock, $0.001 par value, 10,000,000 shares authorized; none issued and outstanding at both June 30, 2017 and December 31, 2016	0	0
Common stock, $0.001 par value; 100,000,000 shares authorized; 24,969,783 and 19,937,095 issued and outstanding at June 30, 2017 and December 31, 2016, respectively	25	20
Additional paid-in capital	499,824	428,507
Accumulated other comprehensive income	9,501	9,533
Accumulated deficit	(426,383)	(389,751)
Total stockholders’ equity	82,967	48,309
Total liabilities and stockholders’ equity	$ 94,984	$ 63,444