Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents	$ 33,104	$ 61,446
Available-for-sale securities	73,691	60,912
Accounts receivable	1,284	524
Prepaid expenses and other current assets	5,108	645
Total current assets	113,187	123,527
Property and equipment, net	2,353	1,228
Available-for-sale securities, non-current	13,165	36,364
Other assets	38	70
Total assets	128,743	161,189
Current liabilities
Accounts payable	3,052	3,685
Accrued liabilities	8,457	8,595
Other current liabilities	298	265
Total current liabilities	11,807	12,545
Non-current liabilities	749	1,570
Total liabilities	$ 12,556	$ 14,115
Commitments and Contingencies (Note 8)
Convertible preferred stock, $0.001 par value — 5,000,000 shares authorized, and zero shares issued and outstanding at December 31, 2015 and December 31, 2014
Stockholders' equity
Common stock, $0.001 par value — 100,000,000 shares authorized, 18,505,462 and 17,551,375 shares issued and outstanding at December 31, 2015 and December 31, 2014, respectively	$ 23	$ 22
Additional paid-in capital	178,473	157,581
Accumulated other comprehensive income (loss)	(158)	(180)
Accumulated deficit	(62,151)	(10,349)
Total stockholders' equity	116,187	147,074
Total liabilities and stockholders’ equity	$ 128,743	$ 161,189