CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 252,092	$ 32,694
Short-term investments	233,435	190,096
Other current assets	10,183	3,870
Total current assets	495,710	226,660
Property and equipment, net	443	473
Other long-term assets	5,303	1,321
Total assets	501,456	228,454
Current liabilities
Accounts payable and accrued liabilities	27,685	25,775
Deferred revenue and other current liabilities	529	371
Total current liabilities	28,214	26,146
Deferred revenue and other liabilities	761	732
Total liabilities	28,975	26,878
Commitments and contingencies (see Note 11)
Stockholders’ equity
Preferred stock, $0.001 par value; 10,000,000 shares authorized; none issued and outstanding at both June 30, 2019 and December 31, 2018	0	0
Common stock, $0.001 par value; 100,000,000 shares authorized; 38,551,426 and 32,538,857 issued and outstanding at June 30, 2019 and December 31, 2018, respectively	39	33
Additional paid-in capital	1,108,306	751,109
Accumulated other comprehensive income	9,788	9,479
Accumulated deficit	(645,652)	(559,045)
Total stockholders’ equity	472,481	201,576
Total liabilities and stockholders’ equity	$ 501,456	$ 228,454