CONDENSED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 7,912	$ 16,335
Restricted cash	268	268
Marketable securities	81,868	78,351
Interest and other receivables	569	436
Prepaid assets	512	580
Total current assets	91,129	95,970
Noncurrent marketable securities	13,184	14,241
Property and equipment, net	86	102
Other assets	1,114
Total assets	105,513	110,313
Current liabilities:
Accounts payable	502	503
Accrued compensation and benefits	1,100	3,385
Accrued collaboration charges	1,841	1,702
Other accrued liabilities	942	926
Total current liabilities	4,385	6,516
Commitments and contingencies
Stockholders' equity:
Common stock	161	160
Additional paid-in capital	1,092,931	1,089,684
Accumulated deficit	(991,633)	(985,840)
Accumulated other comprehensive loss	(331)	(207)
Total stockholders' equity	101,128	103,797
Total liabilities and stockholders' equity	$ 105,513	$ 110,313

Carrying value as of the balance sheet date of obligations incurred and payable to collaboration partner for which invoices have not yet been received under the respective collaboration agreement (due within one year or within the normal operating cycle if longer).

No definition available.