Income Taxes (Tables)
|
12 Months Ended |
Dec. 31, 2015 |
| Income taxes |
|
| Schedule of components of loss before income taxes by U.S. and foreign jurisdictions |
The components of loss before income taxes by U.S. and foreign jurisdictions are as follows (in thousands):
|
|
|
Year ended December 31,
|
|
|
|
|
2015
|
|
2014
|
|
2013
|
|
|
United States
|
|
$
|
88,112
|
|
$
|
46,328
|
|
$
|
23,522
|
|
|
Foreign
|
|
|
1,670
|
|
|
1,164
|
|
|
1,316
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Total
|
|
$
|
89,782
|
|
$
|
47,492
|
|
$
|
24,838
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Schedule of reconciliation of the tax expense computed at the statutory federal rate and Company's tax expense |
|
|
|
Year ended December 31,
|
|
|
|
|
2015
|
|
2014
|
|
2013
|
|
|
U.S. federal taxes at statutory rate
|
|
|
34.0
|
%
|
|
34.0
|
%
|
|
34.0
|
%
|
|
State taxes (net of federal benefit)
|
|
|
0.8
|
|
|
0.7
|
|
|
0.9
|
|
|
Non-deductible expenses
|
|
|
(0.8
|
)
|
|
(0.7
|
)
|
|
(0.4
|
)
|
|
Foreign tax differential
|
|
|
(0.2
|
)
|
|
(0.8
|
)
|
|
(1.8
|
)
|
|
Change in valuation allowance
|
|
|
(33.8
|
)
|
|
(33.2
|
)
|
|
(32.7
|
)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Total
|
|
|
0.0
|
%
|
|
0.0
|
%
|
|
0.0
|
%
|
|
| Schedule of net deferred tax assets |
The tax effects of temporary differences and carryforwards that give rise to significant portions of the deferred tax assets are as follows (in thousands):
|
|
|
As of December 31,
|
|
|
|
|
2015
|
|
2014
|
|
|
Deferred tax assets:
|
|
|
|
|
|
|
|
|
Net operating loss carryforwards
|
|
$
|
53,123
|
|
$
|
28,022
|
|
|
Tax credits
|
|
|
13
|
|
|
13
|
|
|
Accruals and other
|
|
|
7,612
|
|
|
1,914
|
|
|
|
|
|
|
|
|
|
|
|
Gross deferred tax assets
|
|
|
60,748
|
|
|
29,949
|
|
|
Valuation allowance
|
|
|
(60,304
|
)
|
|
(29,498
|
)
|
|
|
|
|
|
|
|
|
|
|
Net deferred tax assets
|
|
|
444
|
|
|
451
|
|
|
Deferred tax liabilities:
|
|
|
|
|
|
|
|
|
Property and equipment
|
|
$
|
(444
|
)
|
$
|
(451
|
)
|
|
|
|
|
|
|
|
|
|
|
Total deferred tax liabilities
|
|
|
(444
|
)
|
|
(451
|
)
|
|
|
|
|
|
|
|
|
|
|
Net deferred tax assets
|
|
$
|
—
|
|
$
|
—
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Schedule of reconciliation of gross unrecognized tax benefits |
A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):
|
|
|
Year ended December 31,
|
|
|
|
|
2015
|
|
2014
|
|
2013
|
|
|
Unrecognized tax benefits, beginning of period
|
|
$
|
5,661
|
|
$
|
2,100
|
|
$
|
618
|
|
|
Gross increases—current period tax positions
|
|
|
2,993
|
|
|
1,874
|
|
|
1,482
|
|
|
Gross increases—prior period tax positions
|
|
|
2,775
|
|
|
1,687
|
|
|
—
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unrecognized tax benefits, end of period
|
|
$
|
11,429
|
|
$
|
5,661
|
|
$
|
2,100
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|