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Organization and Summary of Significant Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedules of Concentration of Risk, by Risk Factor The following table sets forth the percentage of total revenues that the revenues of Distributor A and Distributor B represented for the periods shown.
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2019
 
2018
 
2019
 
2018
Distributor A
17
%
 
17
%
 
16
%
 
15
%
Distributor B
13
%
 
15
%
 
12
%
 
14
%

Contract with Customer, Asset and Liability The table below shows revenue that we recognized as a result of changes in the contract liability balances in the periods shown.
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
(In millions)
2019
 
2018
 
2019
 
2018
Revenue recognized in the period from:
 
 
 
 
 
 
 
Amounts included in contract liabilities at the beginning of the period
$
2.0

 
$
2.0

 
$
2.6

 
$
1.9


Schedule of Earnings Per Share, Basic and Diluted
The following table sets forth the computation of basic and diluted net income (loss) per share for the periods shown.
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
(In millions)
2019
 
2018
 
2019
 
2018
Net income (loss)
$
(10.5
)
 
$
30.2

 
$
(37.4
)
 
$
6.0

 
 
 
 
 
 
 
 
Net income (loss) per common share:
 
 
 
 
 
 
 
Basic
$
(0.12
)
 
$
0.34

 
$
(0.41
)
 
$
0.07

Diluted
$
(0.12
)
 
$
0.34

 
$
(0.41
)
 
$
0.07

 
 
 
 
 
 
 
 
Basic weighted average shares outstanding
91.1

 
88.2

 
90.7

 
87.7

Effect of potentially dilutive stock options

 
0.2

 

 
0.3

Effect of potentially dilutive restricted stock units

 
1.0

 

 
0.8

Diluted weighted average shares outstanding
91.1

 
89.4

 
90.7

 
88.8


Outstanding anti-dilutive securities not included in diluted net loss per share
Outstanding anti-dilutive securities not included in the diluted net income (loss) per share attributable to common stockholders calculations were as follows:
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
(In millions)
2019
 
2018
 
2019
 
2018
Options outstanding to purchase common stock

 

 

 

Unvested restricted stock units
2.1

 

 
2.1

 
0.4

Senior convertible notes due 2022
4.0

 
4.0

 
4.0

 
4.0

Senior convertible notes due 2023
5.2

 

 
5.2

 

2023 Warrants
5.2

 

 
5.2

 

Total
16.5

 
4.0

 
16.5

 
4.4