Condensed Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 33,618	$ 23,735
Available-for-sale securities	94,725	89,917
Accounts receivable	34	794
Prepaid expenses and other current assets	1,814	2,541
Total current assets	130,191	116,987
Property and equipment, net	3,107	3,156
Available-for-sale securities, non-current	16,586	22,292
Other assets	38	38
Total assets	149,922	142,473
Current liabilities
Accounts payable	4,385	3,589
Accrued liabilities	6,396	5,867
Other current liabilities	268	287
Total current liabilities	11,049	9,743
Long-term debt	33,768	0
Other non-current liabilities	1,201	547
Total liabilities	46,018	10,290
Commitments and Contingencies (Note 6)
Stockholders’ equity
Preferred stock, $0.001 par value — 5,000,000 shares authorized, and zero shares issued and outstanding at June 30, 2017 and December 31, 2016	0	0
Common stock, $0.001 par value — 100,000,000 shares authorized, 22,462,838 and 22,013,644 shares issued and outstanding at June 30, 2017 and December 31, 2016, respectively	27	27
Additional paid-in capital	263,042	254,558
Accumulated other comprehensive loss	(183)	(193)
Accumulated deficit	(158,982)	(122,209)
Total stockholders’ equity	103,904	132,183
Total liabilities and stockholders’ equity	$ 149,922	$ 142,473