CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 204,505	$ 46,535
Short-term investments	490,855	368,515
Other current assets	9,456	9,357
Total current assets	704,816	424,407
Property and equipment, net	2,283	1,776
Other long-term assets	6,348	6,017
Total assets	713,447	432,200
Current liabilities
Accounts payable and accrued liabilities	55,450	48,082
Deferred revenue and other current liabilities	597	824
Total current liabilities	56,047	48,906
Other long-term liabilities	1,174	999
Total liabilities	57,221	49,905
Commitments and contingencies (see Note 11)
Shareholders’ equity
Preferred stock, $0.001 par value; 10,000,000 shares authorized; none issued and outstanding at both March 31, 2020 and December 31, 2019	0	0
Common stock, $0.001 par value; 100,000,000 shares authorized; 43,552,312 and 39,517,329 issued and outstanding at March 31, 2020 and December 31, 2019, respectively	44	40
Additional paid-in capital	1,505,431	1,144,667
Accumulated other comprehensive income	9,707	9,889
Accumulated deficit	(858,956)	(772,301)
Total shareholders’ equity	656,226	382,295
Total liabilities and shareholders’ equity	$ 713,447	$ 432,200