|
Note 6 - Share Capital (Tables)
|
12 Months Ended |
|
Dec. 31, 2014
|
| Note 6 - Share Capital (Tables) [Line Items] |
|
| Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] |
|
|
|
2014
|
|
|
2013
|
|
|
|
|
Shares
Underlying
Warrants
|
|
|
Shares
Underlying
Warrants
|
|
|
Balance, beginning of year
|
|
|
10,922,090
|
|
|
|
5,922,090
|
|
|
Warrants issued
|
|
|
—
|
|
|
|
5,000,000
|
|
|
Warrants expired
|
|
|
(2,691,242
|
)
|
|
|
—
|
|
|
Balance, end of year
|
|
|
8,230,848
|
|
|
|
10,922,090
|
|
|
| Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|
|
|
Years Ended December 31,
|
|
|
|
|
2014
|
|
|
2013
|
|
|
2012
|
|
|
|
|
(in thousands, except share and per share amounts)
|
|
|
Numerator:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net loss used to compute net loss per share
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Basic
|
|
$
|
(49,963
|
)
|
|
$
|
(38,759
|
)
|
|
$
|
(3,415
|
)
|
|
Adjustments for change in fair value of warrant liability
|
|
|
—
|
|
|
|
—
|
|
|
|
(25,520
|
)
|
|
Diluted
|
|
$
|
(49,963
|
)
|
|
$
|
(38,759
|
)
|
|
$
|
(28,935
|
)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Denominator:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Weighted average shares outstanding used to compute net loss per share:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Basic
|
|
|
77,619,807
|
|
|
|
62,387,616
|
|
|
|
53,728,672
|
|
|
Dilutive effect of warrants
|
|
|
—
|
|
|
|
—
|
|
|
|
1,171,283
|
|
|
Diluted
|
|
|
77,619,807
|
|
|
|
62,387,616
|
|
|
|
54,899,955
|
|
|
Net loss per share—basic
|
|
$
|
(0.64
|
)
|
|
$
|
(0.62
|
)
|
|
$
|
(0.06
|
)
|
|
Net loss per share—diluted
|
|
$
|
(0.64
|
)
|
|
$
|
(0.62
|
)
|
|
$
|
(0.53
|
)
|
|
| Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] |
|
|
|
Years Ended December 31,
|
|
|
|
|
2014
|
|
|
2013
|
|
|
2012
|
|
|
Director and employee stock options
|
|
|
5,217,535
|
|
|
|
4,415,033
|
|
|
|
2,934,453
|
|
|
Warrants
|
|
|
8,230,848
|
|
|
|
10,922,090
|
|
|
|
48,701
|
|
|
Series A convertible preferred stock (as converted to common stock)
|
|
|
10,000,000
|
|
|
|
—
|
|
|
|
—
|
|
|
Non-employee director restricted share units
|
|
|
163,204
|
|
|
|
191,613
|
|
|
|
140,968
|
|
|
Employee stock purchase plan
|
|
|
3,997
|
|
|
|
2,765
|
|
|
|
4,758
|
|
|
| Warrants Classified as Equity [Member] |
|
| Note 6 - Share Capital (Tables) [Line Items] |
|
| Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] |
|
|
|
Years Ended December 31,
|
|
|
|
|
2014
|
|
|
2013
|
|
|
Shares underlying warrants outstanding classified as liabilities
|
|
|
3,182,147
|
|
|
|
5,873,389
|
|
|
Shares underlying warrants outstanding classified as equity
|
|
|
5,048,701
|
|
|
|
5,048,701
|
|
|
| Warrants [Member] |
|
| Note 6 - Share Capital (Tables) [Line Items] |
|
| Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] |
|
Exercise Prices
|
|
Shares
Underlying
Outstanding
Warrants
|
|
|
Expiry Date
|
|
$3.08
|
|
|
48,701
|
|
|
February 8, 2018
|
|
$4.24
|
|
|
3,182,147
|
|
|
October 12, 2015
|
|
$5.00
|
|
|
5,000,000
|
|
|
December 5, 2018
|
|
|
|
|
8,230,848
|
|
|
|
|