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INCOME TAXES (Tables)
 12 Months Ended
Dec. 31, 2018
Income Tax Disclosure [Abstract]  
Schedule of income tax Benefit (provisions) from continuing operations
Income tax provisions from continuing operations consisted of the following (in thousands):
 
Year Ended December 31,
 
2018
 
2017
 
2016
Income (loss) from continuing operations before provisions for income taxes
$
54,735

 
$
(44,811
)
 
$
(14,509
)
Provision for income taxes from continuing operations
(392
)
 
(480
)
 
(25,521
)
Effective tax rate
0.7
%
 
(1.1
)%
 
(175.9
)%
Details of pre-tax book income (loss) from continuing operations
The Company reported pre-tax book income or loss from continuing operations of (in thousands):
 
Year Ended December 31,
 
2018
 
2017
 
2016
Domestic
$
49,509

 
$
(23,994
)
 
$
(14,656
)
Foreign
5,226

 
(20,817
)
 
147

Total
$
54,735

 
$
(44,811
)
 
$
(14,509
)
Summary of benefit (provision) for income taxes from continuing operations
The provisions for income taxes from continuing operations consisted of the following (in thousands):

 
Year Ended December 31,
 
2018
 
2017
 
2016
Current:
 
 
 
 
 
U.S. federal
$
—

 
$
—

 
$
(1,649
)
State and local
(3
)
 
(5
)
 
859

Foreign
(331
)
 
(448
)
 
(442
)
Total current
$
(334
)
 
$
(453
)
 
$
(1,232
)
Deferred:
 
 
 
 
 
U.S. federal
—

 
—

 
(24,261
)
State and local
—

 
—

 
—

Foreign
(58
)
 
(27
)
 
(28
)
Total deferred
(58
)
 
(27
)
 
(24,289
)
Total provision for income taxes
$
(392
)
 
$
(480
)
 
$
(25,521
)
Details of significant components of net deferred tax assets and liabilities
 
December 31,
 
2018
 
2017
Deferred tax assets:
 
Net operating loss carryforwards
$
4,968

 
$
13,394

State income taxes
1

 
1

Deferred revenue
2,347

 
5,349

Research and development and other credits
9,590

 
11,447

Reserves and accruals recognized in different periods
3,734

 
3,088

Basis difference in investment
—

 
583

Capitalized R&D expenses
3,415

 
3,623

Depreciation and amortization
472

 
413

Deferred rent
160

 
183

Other
6

 
—

Total deferred tax assets
24,693

 
38,081

Valuation allowance
(24,398
)
 
(37,680
)
Net deferred tax assets
295

 
401

  Foreign credits
(29
)
 
(43
)
Other
(17
)
 
—

Net deferred tax liabilities
(46
)
 
(43
)
Net deferred taxes
$
249

 
$
358
Reconciliation between benefit (provision) for income taxes at statutory rate and effective tax rate
For purposes of the reconciliation between the provision for income taxes at the statutory rate and the effective tax rate, a national U.S. 21% rate is applied for 2018, the year in which the Tax Act took effect. For prior years presented in the table below, the national U.S. rate of 35%, the rate in effect prior to the Tax Act change, was applied for the reconciliation between the provision for income taxes at the statutory rate and the effective tax rate:
 
2018
 
2017
 
2016
Federal statutory tax rate
21.0
 %
 
35.0
 %
 
35.0
 %
Sale of IP rights to foreign subsidiary
—
 %

—
 %
 
(13.8
)%
Foreign withholding
0.1
 %

(0.2
)%
 
(1.2
)%
Stock compensation expense
(1.0
)%

(2.0
)%
 
(6.6
)%
Foreign rate differential
(1.5
)%

(17.0
)%
 
(1.2
)%
Prior year true-up items
—
 %

(0.1
)%
 
(0.3
)%
Tax reserves
(1.3
)%

(0.1
)%
 
1.8
 %
Loss on expiration of capital loss carryover
1.1
 %

—
 %
 
—
 %
Credits
(0.1
)%

0.4
 %
 
1.6
 %
Other
0.9
 %

—
 %
 
(1.6
)%
2017 Tax Act impact
1.1
 %
 
(28.7
)%
 
—
 %
Valuation allowance
(19.6
)%

11.6
 %
 
(193.4
)%
State refunds
—
 %
 
—
 %
 
3.8
 %
Effective tax rate
0.7
 %
 
(1.1
)%
 
(175.9
)%
Details of beginning and ending amount of gross unrecognized tax benefits
The Company maintains liabilities for uncertain tax positions. These liabilities involve considerable judgment and estimation and are continuously monitored by management based on the best information available, including changes in tax regulations, the outcome of relevant court cases, and other information. A reconciliation of the beginning and ending amount of gross unrecognized tax benefits is as follows (in thousands):
 
2018
 
2017
 
2016
Balance at beginning of year
$
4,672

 
$
6,232

 
$
6,285

Gross increases for tax positions of prior years
—

 
—

 
—

Gross decreases for federal tax rate change for tax positions of prior years
—

 
(1,670
)
 
(22
)
Gross increases for tax positions of current year
45

 
110

 
111

Lapse of statute of limitations
(106
)
 
—

 
(142
)
Balance at end of year
$
4,611

 
$
4,672

 
$
6,232