Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 120,585	$ 53,563
Investments	11,839	13,115
Trade accounts receivable	77	78
Prepaid expenses	1,638	342
Other current assets	12	0
Total current assets	134,151	67,098
Property and equipment, net	5,016	2,536
Intellectual property, net	157	167
Total assets	139,324	69,801
Current liabilities:
Accounts payable	2,623	2,129
Accrued liabilities	2,543	494
Deferred revenue and income	127	13
Capital lease obligations	13	147
Total current liabilities	5,306	2,783
Long-term deferred income	1,000	1,014
Long-term capital lease obligation	0	13
Total liabilities	$ 6,306	$ 3,810
Commitments and Contingencies
Stockholders' equity:
Common stock, $0.001 par value; 55,000,000 common shares authorized 51,191,184 (as of December 31, 2015) and 44,639,829 (as of December 31, 2014) shares issued and outstanding	$ 51	$ 45
Preferred stock, $0.001 par value; 5,000,000 preferred shares authorized and none outstanding as of December 31, 2015 and December 31, 2014	0	0
Contributed capital	243,894	131,356
Accumulated deficit	(110,915)	(65,417)
Accumulated other comprehensive income (loss)	(12)	7
Total stockholders' equity	133,018	65,991
Total liabilities and stockholders' equity	$ 139,324	$ 69,801