|
Note 9 - Income Taxes (Tables)
|
12 Months Ended |
|
Dec. 31, 2014
|
| Income Tax Disclosure [Abstract] |
|
| Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] |
|
|
|
Year Ended December 31,
|
|
|
|
|
2014
|
|
|
2013
|
|
|
2012
|
|
|
United States
|
|
$
|
(2,684
|
)
|
|
$
|
(2,507
|
)
|
|
$
|
(2,852
|
)
|
|
Foreign
|
|
|
(18,186
|
)
|
|
|
(8,919
|
)
|
|
|
(4,166
|
)
|
|
Total
|
|
$
|
(20,870
|
)
|
|
$
|
(11,426
|
)
|
|
$
|
(7,018
|
)
|
|
| Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] |
|
|
|
Year Ended December 31,
|
|
|
|
|
2014
|
|
|
2013
|
|
|
2012
|
|
|
Current:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
U.S. Federal
|
|
$
|
350
|
|
|
$
|
1,816
|
|
|
$
|
3,760
|
|
|
U.S. State
|
|
|
55
|
|
|
|
1
|
|
|
|
(132
|
)
|
|
Foreign
|
|
|
846
|
|
|
|
98
|
|
|
|
91
|
|
|
|
|
|
1,251
|
|
|
|
1,915
|
|
|
|
3,719
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Deferred:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
U.S. Federal
|
|
|
895
|
|
|
|
(135
|
)
|
|
|
4,842
|
|
|
U.S. State
|
|
|
—
|
|
|
|
—
|
|
|
|
5,088
|
|
|
Foreign
|
|
|
(408
|
)
|
|
|
(28
|
)
|
|
|
24
|
|
|
|
|
|
487
|
|
|
|
(163
|
)
|
|
|
9,954
|
|
|
Total
|
|
$
|
1,738
|
|
|
$
|
1,752
|
|
|
$
|
13,673
|
|
|
| Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|
|
|
Year Ended December 31,
|
|
|
|
|
2014
|
|
|
2013
|
|
|
2012
|
|
|
Provision (benefit) at statutory rate
|
|
$
|
(7,096
|
)
|
|
$
|
(3,886
|
)
|
|
$
|
(2,456
|
)
|
|
State income taxes
|
|
|
1,651
|
|
|
|
303
|
|
|
|
200
|
|
|
Research and development credits
|
|
|
(7,384
|
)
|
|
|
(5,850
|
)
|
|
|
(1,345
|
)
|
|
Change in valuation allowance
|
|
|
5,271
|
|
|
|
6,781
|
|
|
|
15,247
|
|
|
Foreign earnings, taxed at different rates
|
|
|
6,381
|
|
|
|
2,888
|
|
|
|
1,649
|
|
|
Unrecognized tax benefits
|
|
|
1,713
|
|
|
|
1,708
|
|
|
|
1,487
|
|
|
Stock-based compensation
|
|
|
166
|
|
|
|
142
|
|
|
|
336
|
|
|
Tax exempt income
|
|
|
(83
|
)
|
|
|
(157
|
)
|
|
|
(197
|
)
|
|
Prior year return to provision adjustment
|
|
|
292
|
|
|
|
(257
|
)
|
|
|
(1,264
|
)
|
|
Cortina acquisition transaction cost
|
|
|
444
|
|
|
|
—
|
|
|
|
—
|
|
|
Other
|
|
|
383
|
|
|
|
80
|
|
|
|
16
|
|
|
|
|
$
|
1,738
|
|
|
$
|
1,752
|
|
|
$
|
13,673
|
|
|
| Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|
|
|
December 31,
|
|
|
|
|
2014
|
|
|
2013
|
|
|
Deferred tax assets
|
|
|
|
|
|
|
|
|
|
Net operating loss carry forwards
|
|
$
|
8,314
|
|
|
$
|
8,532
|
|
|
Research and development credits
|
|
|
30,637
|
|
|
|
15,460
|
|
|
Stock-based compensation
|
|
|
6,966
|
|
|
|
5,192
|
|
|
Accrued expenses and allowances
|
|
|
2,117
|
|
|
|
1,592
|
|
|
Amortization and depreciation
|
|
|
1,052
|
|
|
|
—
|
|
|
Other temporary differences
|
|
|
3,461
|
|
|
|
111
|
|
|
Valuation allowance
|
|
|
(39,682
|
)
|
|
|
(22,448
|
)
|
|
Total deferred tax assets
|
|
|
12,865
|
|
|
|
8,439
|
|
|
|
|
|
|
|
|
|
|
|
|
Deferred tax liabilities
|
|
|
|
|
|
|
|
|
|
Subpart F income on foreign subsidiaries earnings
|
|
|
(5,981
|
)
|
|
|
(5,621
|
)
|
|
Acquired intangible assets
|
|
|
(6,157
|
)
|
|
|
—
|
|
|
Amortization and depreciation
|
|
|
—
|
|
|
|
(2,790
|
)
|
|
Other deferred tax liabilities
|
|
|
(820
|
)
|
|
|
—
|
|
|
Total deferred tax liabilities
|
|
|
(12,958
|
)
|
|
|
(8,411
|
)
|
|
Deferred tax assets (liabilities), net
|
|
$
|
(93
|
)
|
|
$
|
28
|
|
|
| Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] |
|
|
|
Year Ended December 31,
|
|
|
|
|
2014
|
|
|
2013
|
|
|
2012
|
|
|
Balance as of January 1
|
|
$
|
8,031
|
|
|
$
|
6,155
|
|
|
$
|
4,132
|
|
|
Increases based on tax positions related to the current year
|
|
|
3,102
|
|
|
|
1,918
|
|
|
|
1,418
|
|
|
Increase (decreases) based on tax positions of prior year
|
|
|
(61
|
)
|
|
|
(42
|
)
|
|
|
605
|
|
|
Gross increases for acquired unrecognized tax benefits
|
|
|
33,935
|
|
|
|
—
|
|
|
|
—
|
|
|
Statute of limitation expirations
|
|
|
(926
|
)
|
|
|
—
|
|
|
|
—
|
|
|
Balance as of December 31
|
|
$
|
44,081
|
|
|
$
|
8,031
|
|
|
$
|
6,155
|
|
|