CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 22,383	$ 49,493
Short-term investments	34,351	72,834
Other current assets	2,821	3,075
Total current assets	59,555	125,402
Property and equipment, net	629	614
Other long-term assets	3,260	2,001
Total assets	63,444	128,017
Current liabilities
Accounts payable and accrued liabilities	15,002	9,798
Total current liabilities	15,002	9,798
Other liabilities	133	43
Total current liabilities	15,135	9,841
Commitments and contingencies
Stockholders' equity
Preferred stock, $0.001 par value, 10,000,000 shares authorized; none issued and outstanding at both December 31, 2016 and December 31, 2015	0	0
Common stock, $0.001 par value; 100,000,000 authorized; 19,937,095 and 19,282,935 issued and outstanding at December 31, 2016 and December 31, 2015, respectively	20	19
Additional paid-in capital	428,507	415,232
Accumulated other comprehensive income	9,533	9,558
Accumulated deficit	(389,751)	(306,633)
Total stockholders' equity	48,309	118,176
Total liabilities and stockholders' equity	$ 63,444	$ 128,017