| Income Tax Disclosure [Abstract] | Period [Axis] |
|---|
2015-01-01 - 2015-12-31 |
|---|
Income Tax Disclosure [Abstract] | |
Domestic and Foreign (Loss)/Income Before Provision for Income Taxes |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2015
|
|
2014
|
|
2013
|
|
|
|
|
(in thousands)
|
|
|
Domestic
|
|
$
|
(55,900)
|
|
$
|
(22,037)
|
|
$
|
(63,421)
|
|
|
Foreign
|
|
|
(15,670)
|
|
|
(16,449)
|
|
|
410
|
|
|
Loss before provision for income taxes
|
|
$
|
(71,570)
|
|
$
|
(38,486)
|
|
$
|
(63,011)
|
|
|
Provision for Income Taxes |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2015
|
|
2014
|
|
2013
|
|
|
|
|
(in thousands)
|
|
|
Current:
|
|
|
|
|
|
|
|
|
|
|
|
Federal
|
|
$
|
(20)
|
|
$
|
233
|
|
$
|
-
|
|
|
State
|
|
|
122
|
|
|
-
|
|
|
44
|
|
|
Foreign
|
|
|
1,166
|
|
|
892
|
|
|
303
|
|
|
|
|
|
1,268
|
|
|
1,125
|
|
|
347
|
|
|
Deferred:
|
|
|
|
|
|
|
|
|
|
|
|
Federal
|
|
|
238
|
|
|
-
|
|
|
-
|
|
|
State
|
|
|
39
|
|
|
-
|
|
|
-
|
|
|
Foreign
|
|
|
224
|
|
|
(226)
|
|
|
-
|
|
|
|
|
|
501
|
|
|
(226)
|
|
|
-
|
|
|
Provision for income taxes
|
|
$
|
1,769
|
|
$
|
899
|
|
$
|
347
|
|
|
Components of Deferred Tax Assets and Deferred Tax Liabilities |
|
|
|
|
|
|
|
|
|
|
|
|
December 31,
|
|
|
|
|
2015
|
|
2014
|
|
|
|
|
(in thousands)
|
|
|
Deferred tax assets:
|
|
|
|
|
|
|
|
|
Net operating loss carryforwards
|
|
$
|
60,325
|
|
$
|
56,794
|
|
|
Research and development credits
|
|
|
34,744
|
|
|
28,509
|
|
|
Stock compensation
|
|
|
19,444
|
|
|
16,620
|
|
|
Capitalized research expenses
|
|
|
2,551
|
|
|
3,695
|
|
|
Impairment loss on available for sale securities/capital loss carryforward
|
|
|
679
|
|
|
685
|
|
|
Intangible assets
|
|
|
1,882
|
|
|
-
|
|
|
Other temporary differences
|
|
|
10,391
|
|
|
5,070
|
|
|
Total gross deferred tax assets
|
|
|
130,016
|
|
|
111,373
|
|
|
Valuation allowance
|
|
|
(121,072)
|
|
|
(100,586)
|
|
|
Net deferred tax assets
|
|
$
|
8,944
|
|
$
|
10,787
|
|
|
Deferred tax liabilities:
|
|
|
|
|
|
|
|
|
Convertible Notes
|
|
$
|
(8,560)
|
|
$
|
(10,079)
|
|
|
Other temporary differences
|
|
|
(661)
|
|
|
(485)
|
|
|
Total deferred tax liabilities
|
|
$
|
(9,221)
|
|
$
|
(10,564)
|
|
|
Net deferred tax (liabilities) assets
|
|
$
|
(277)
|
|
$
|
223
|
|
|
Reported as:
|
|
|
|
|
|
|
|
|
Short-term deferred tax assets
|
|
$
|
-
|
|
$
|
402
|
|
|
Long-term deferred tax liabilities
|
|
|
(277)
|
|
|
(179)
|
|
|
Net deferred tax (liabilities) assets
|
|
$
|
(277)
|
|
$
|
223
|
|
|
Summary of Statutory Tax Rates and Effective Tax Rates |
|
|
|
|
|
|
|
|
|
|
|
|
December 31,
|
|
|
|
|
2015
|
|
2014
|
|
2013
|
|
|
Statutory rate benefit
|
|
(35)
|
%
|
(35)
|
%
|
(35)
|
%
|
|
State and local income tax benefit (net of federal tax benefit)
|
|
(1)
|
|
(1)
|
|
(2)
|
|
|
Foreign rate differential
|
|
4
|
|
6
|
|
-
|
|
|
Credits
|
|
(7)
|
|
3
|
|
(11)
|
|
|
Stock compensation
|
|
5
|
|
9
|
|
-
|
|
|
NOL accrual to return
|
|
-
|
|
(3)
|
|
-
|
|
|
Fines and penalties
|
|
6
|
|
-
|
|
-
|
|
|
Other
|
|
1
|
|
2
|
|
7
|
|
|
Valuation allowance
|
|
29
|
|
21
|
|
42
|
|
|
Effective tax rate
|
|
2
|
%
|
2
|
%
|
1
|
%
|
|