Annual report pursuant to Section 13 and 15(d)

Income Taxes (Tables)

v3.8.0.1
Income Taxes (Tables)
12 Months Ended
Dec. 31, 2017
Income Tax Disclosure [Abstract]  
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes and operating loss and credit carryforwards. Significant components of our deferred tax assets are as follows (in thousands):
 
 
 
December 31,
 
 
 
2017
 
2016
 
Deferred tax assets:
 
 
 
 
 
 
 
Net operating loss carryforwards
 
$
62,295
 
$
87,267
 
Research credit carryforwards
 
 
15,873
 
 
14,322
 
Other, net
 
 
1,705
 
 
2,637
 
Total deferred tax assets
 
 
79,873
 
 
104,226
 
Valuation allowance
 
 
(79,873)
 
 
(104,226)
 
Net deferred tax assets
 
$
 
$
 
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
The provision for income taxes consists of state minimum taxes due. The effective tax rate of our provision (benefit) for income taxes differs from the federal statutory rate as follows (in thousands):
 
 
 
Year Ending December 31,
 
 
 
2017
 
2016
 
2015
 
Computed at 34%
 
$
(4,832)
 
$
1,758
 
$
(3,840)
 
State taxes
 
 
(157)
 
 
(187)
 
 
(268)
 
Change in valuation allowance
 
 
(28,555)
 
 
(4,439)
 
 
2,740
 
Other
 
 
388
 
 
659
 
 
(20)
 
Revaluation of warrant liability
 
 
(210)
 
 
(280)
 
 
1,534
 
Research and development credits
 
 
(250)
 
 
(252)
 
 
(146)
 
Net operating loss carryforward expirations
 
 
1,007
 
 
2,741
 
 
 
Impact of 2017 Tax Act
 
 
32,609
 
 
 
 
 
Total
 
$
 
$
 
$