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Basis of Presentation (Tables)
 12 Months Ended
Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Summary of computation of basic and diluted net income (loss) per share
The following table sets forth the computation of basic and diluted net income (loss) per share for the periods indicated (in thousands, except per share amounts):
 
 
Year Ended December 31,
EPS Attributable to Common Shareholders
2014
 
2013
 
2012
Net income (loss) from continuing operations
12,024

 
$
8,832

 
$
(2,674
)
Discontinued operations
—

 
2,588

 
2,147

Net income (loss)
$
12,024

 
$
11,420

 
$
(527
)
Shares used to compute basic income (loss) per share
20,418,569

 
20,312,395

 
19,853,095

Dilutive potential common shares:
 
 
 
 
 
Stock options
978,162

 
352,959

 
—

Restricted stock
36,446

 
80,100

 
—

Shares used to compute diluted income (loss) per share
21,433,177

 
20,745,454

 
19,853,095

Basic per share amounts:
 
 
 
 
 
Income (loss) from continuing operations
$
0.59

 
$
0.43

 
$
(0.14
)
Discontinued operations
—

 
0.13

 
0.11

Net income (loss)
$
0.59

 
$
0.56

 
$
(0.03
)
 
 
 
 
 
 
Diluted per share amounts:
 
 
 
 
 
Income (loss) from continuing operations
$
0.56

 
$
0.43

 
$
(0.14
)
Discontinued operations
—

 
0.12

 
0.11

Net income (loss)
$
0.56

 
$
0.55

 
$
(0.03
)
Summary of investment categories
The following table summarizes the various investment categories at December 31, 2014 and 2013 (in thousands):

 
Cost
 
Gross unrealized
gains
 
Gross unrealized
losses
 
Estimated
fair value
December 31, 2014
 
 
 
 
 
 
 
Short-term investments
$
2,179

 
$
4,954

 
$
—

 
$
7,133

Certificates of deposit - restricted
1,261

 
—

 
—

 
1,261

 
$
3,440

 
$
4,954

 
$
—

 
$
8,394

December 31, 2013
 
 
 
 
 
 
 
Short-term investments
1,426

 
2,914

 
$
—

 
$
4,340

Certificates of deposit-restricted
1,341

 
—

 
—

 
1,341

 
$
2,767

 
$
2,914

 
$
—

 
$
5,681
Schedule of major customers
A relatively small number of partners accounts for a significant percentage of our revenue. Revenue from significant partners, which is defined as 10% or more of our total revenue, was as follows:
 
December 31,
 
2014
 
2013
 
2012
Partner A
37
%
 
33
%
 
32
%
Partner B
31
%
 
28
%
 
15
%
Partner C
10
%
 
14
%
 
19
%
Summary of property and equipment
Property and equipment is stated at cost and consists of the following (in thousands):
 
 
December 31,
 
2014
 
2013
Lab and office equipment
$
2,232

 
$
3,737

Leasehold improvements
273

 
387

Computer equipment and software
624

 
616

 
3,129

 
4,740

Less accumulated depreciation and amortization
(2,643
)
 
(3,873
)
 
$
486

 
$
867
Summary of goodwill and other identifiable intangible assets
Goodwill and other identifiable intangible assets consist of the following (in thousands):
 
 
December 31,
 
2014
 
2013
Indefinite lived intangible assets
 
 
 
     Acquired in-process research and development
$
12,556

 
$
12,556

     Goodwill
12,238

 
12,238

Definite lived intangible assets
 
 
 
     Complete technology
15,267

 
15,267

          Less: Accumulated amortization
(2,999
)
 
(2,235
)
     Trade name
2,642

 
2,642

          Less: Accumulated amortization
(519
)
 
(387
)
     Customer relationships
29,600

 
29,600

          Less: Accumulated amortization
(5,824
)
 
(4,344
)
Total goodwill and other identifiable intangible assets, net
$
62,961

 
$
65,337
Stock option weighted average assumptions
The fair-value for options that were awarded to employees and directors was estimated at the date of grant using the Black-Scholes option valuation model with the following weighted average assumptions:
 
 
Year Ended December 31,
 
2014
 
2013
 
2012
Risk-free interest rate
1.9%
 
1.13%-1.82%
 
0.83%-1.14%
Dividend yield
—
 
—
 
—
Expected volatility
62%-69%
 
69%
 
69%
Expected term
6 years
 
6 years
 
6 years
Forfeiture rate
8.6%-9.7%
 
8.4%-9.8%
 
8.0%-11.2%
Schedule for accounting for share-based compensation
The following table summarizes stock-based compensation expense recorded as components of research and development expenses and general and administrative expenses for the periods indicated (in thousands):

 
December 31,
 
2014
 
2013
 
2012
Stock-based compensation expense as a component of:
 
 
 
 
 
Research and development expenses
$
3,595

 
$
1,705

 
$
1,448

General and administrative expenses
7,675

 
3,961

 
2,619

 
$
11,270

 
$
5,666

 
$
4,067