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CONDENSED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 19,127	$ 16,335
Restricted cash	269	268
Marketable securities	141,800	78,351
Interest and other receivables	773	436
Prepaid assets	301	580
Total current assets	162,270	95,970
Noncurrent marketable securities	20,250	14,241
Property and equipment, net	71	102
Other assets	676
Total assets	183,267	110,313
Current liabilities:
Accounts payable	458	503
Accrued compensation and benefits	1,531	3,385
Accrued collaboration charges	2,192	1,702
Other accrued liabilities	724	926
Total current liabilities	4,905	6,516
Commitments and contingencies
Stockholders' equity:
Common stock	183	160
Additional paid-in capital	1,176,823	1,089,684
Accumulated deficit	(998,567)	(985,840)
Accumulated other comprehensive loss	(77)	(207)
Total stockholders' equity	178,362	103,797
Total liabilities and stockholders' equity	$ 183,267	$ 110,313

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-Topic 505
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 4.E)
-URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(31))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(30))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- References

No definition available.

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