CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 20,567	$ 107,703
Short-term investments	128,085	43,134
Other current assets	4,421	4,922
Total current assets	153,073	155,759
Property and equipment, net	484	525
Other long-term assets	987	962
Total assets	154,544	157,246
Current liabilities
Accounts payable and accrued liabilities	15,761	13,644
Deferred revenue and other current liabilities	249	0
Total current liabilities	16,010	13,644
Other liability	693
Other Liabilities, Noncurrent	400	314
Total liabilities	16,703	13,958
Stockholders’ equity
Preferred stock, $0.001 par value, 10,000,000 shares authorized; none issued and outstanding at both March 31, 2018 and December 31, 2017	0	0
Common stock, $0.001 par value; 100,000,000 shares authorized; 29,025,834 and 28,622,886 issued and outstanding at March 31, 2018 and December 31, 2017, respectively	29	29
Additional paid-in capital	603,957	594,407
Accumulated other comprehensive income	9,191	9,479
Accumulated deficit	(475,336)	(460,627)
Total stockholders’ equity	137,841	143,288
Total liabilities and stockholders’ equity	$ 154,544	$ 157,246