CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 74,605	$ 32,694
Short-term investments	226,380	190,096
Other current assets	5,397	3,870
Total current assets	306,382	226,660
Property and equipment, net	429	473
Other long-term assets	2,550	1,321
Total assets	309,361	228,454
Current liabilities
Accounts payable and accrued liabilities	24,465	25,775
Deferred revenue and other current liabilities	638	371
Total current liabilities	25,103	26,146
Deferred revenue and other liabilities	704	732
Total liabilities	25,807	26,878
Commitments and contingencies
Stockholders’ equity
Preferred stock, $0.001 par value, 10,000,000 shares authorized; none issued and outstanding at both March 31, 2019 and December 31, 2018	0	0
Common stock, $0.001 par value; 100,000,000 shares authorized; 36,029,093 and 32,538,857 issued and outstanding at March 31, 2019 and December 31, 2018, respectively	36	33
Additional paid-in capital	873,838	751,109
Accumulated other comprehensive income	9,637	9,479
Accumulated deficit	(599,957)	(559,045)
Total stockholders’ equity	283,554	201,576
Total liabilities and stockholders’ equity	$ 309,361	$ 228,454