Condensed Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 27,040	$ 15,960
Short-term investments	80,502	98,103
Restricted cash	462	1,256
Prepaid expenses	7,565	8,159
Contract and other receivables	143	10,021
Other current assets	522	759
Total current assets	116,234	134,258
Property and equipment, net	12,322	5,400
Intangibles, net	1,062	1,081
Other assets	310	344
Total assets	129,928	141,083
Current liabilities:
Accounts payable	3,504	2,717
Accrued liabilities	5,472	6,329
Accrued compensation	1,863	2,392
Current portion of deferred revenue	258	1,194
Total current liabilities	11,097	12,632
Term loan, less debt issuance costs	19,786	0
Deferred revenue, less current portion	2,029	2,065
Other long-term liabilities	8,570	2,308
Total liabilities	41,482	17,005
Commitments and Contingencies
Stockholders’ equity:
Common stock, $0.001 par value; 200,000,000 shares authorized, 52,787,756 and 52,669,266 shares issued and outstanding at June 30, 2016 (unaudited) and December 31, 2015, respectively	53	53
Additional paid-in capital	322,287	315,673
Accumulated other comprehensive loss	(83)	(133)
Accumulated deficit	(233,811)	(191,515)
Total stockholders’ equity	88,446	124,078
Total liabilities and stockholders’ equity	$ 129,928	$ 141,083