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Financial Statement Details (Tables)
6 Months Ended
Jun. 30, 2017
Disclosure of Financial Statement Details [Abstract]  
Property, Plant and Equipment [Table Text Block]
Property and Equipment
 
June 30, 2017
 
December 31, 2016
Building (1)
$
6.0

 
$
6.0

Furniture and fixtures
4.7

 
5.8

Computer equipment
23.6

 
22.7

Machinery and equipment
32.1

 
31.4

Leasehold improvements
33.1

 
25.6

Construction in progress
74.2

 
65.1

Total
173.7

 
156.6

Accumulated depreciation and amortization
(48.7
)
 
(47.2
)
Property and equipment, net
$
125.0

 
$
109.4

(1) As described in Footnote 5 “Commitments and Contingencies,” although we do not legally own these premises, we are deemed the owner of the construction project during the construction period of our new manufacturing facility in Mesa, Arizona under a build-to-suit lease arrangement.
Financial Statement Details
Financial Statement Details (in millions)
Short-Term Marketable Securities, Available-for-Sale
Short-term marketable securities, consisting solely of debt securities, were as follows:
 
June 30, 2017
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Market
Value
U.S. government agencies
$
70.6

 
$

 
$

 
$
70.6

Commercial paper
25.2

 

 

 
25.2

Corporate debt
4.9

 

 

 
4.9

Total
$
100.7

 
$

 
$

 
$
100.7


 
December 31, 2016
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Market
Value
U.S. government agencies
$
22.2

 
$

 
$

 
$
22.2

Corporate debt
3.8

 

 

 
3.8

Commercial paper
3.2

 

 

 
3.2

Total
$
29.2

 
$

 
$

 
$
29.2


As of June 30, 2017, the estimated market value of available-for-sale marketable securities with contractual maturities of up to one year and up to 17 months were $83.5 million and $17.2 million, respectively.
Inventory
 
June 30, 2017
 
December 31, 2016
Raw materials
$
16.3

 
$
20.1

Work-in-process
4.1

 
2.3

Finished goods
22.4

 
23.0

Total
$
42.8

 
$
45.4


During 2016, we recorded charges of $3.5 million in cost of goods sold related to excess and obsolete receiver inventory primarily related to the February 23, 2016 customer notification regarding the audible alarms and alerts associated with our receivers which was classified as a voluntary Class 1 recall by the FDA.
Property and Equipment
 
June 30, 2017
 
December 31, 2016
Building (1)
$
6.0

 
$
6.0

Furniture and fixtures
4.7

 
5.8

Computer equipment
23.6

 
22.7

Machinery and equipment
32.1

 
31.4

Leasehold improvements
33.1

 
25.6

Construction in progress
74.2

 
65.1

Total
173.7

 
156.6

Accumulated depreciation and amortization
(48.7
)
 
(47.2
)
Property and equipment, net
$
125.0

 
$
109.4

(1) As described in Footnote 5 “Commitments and Contingencies,” although we do not legally own these premises, we are deemed the owner of the construction project during the construction period of our new manufacturing facility in Mesa, Arizona under a build-to-suit lease arrangement.
Accounts Payable and Accrued Liabilities
 
June 30, 2017
 
December 31, 2016
Accounts payable trade
$
16.8

 
$
24.5

Accrued tax, audit, and legal fees
13.6

 
4.5

Clinical trials
0.3

 
1.1

Accrued rebates
13.0

 
8.2

Accrued warranty
8.3

 
9.8

Accrued other
20.2

 
20.0

Total
$
72.2

 
$
68.1



Accrued Warranty
Warranty costs are reflected in the consolidated statements of operations as product cost of sales. A reconciliation of our accrued warranty costs for the three and six months ended June 30, 2017 and 2016 were as follows:
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2017
 
2016
 
2017
 
2016
Beginning balance
$
9.9

 
$
5.7

 
$
9.8

 
$
3.3

Charges to costs and expenses
3.4

 
7.3

 
8.4

 
13.5

Costs incurred
(5.0
)
 
(5.1
)
 
(9.9
)
 
(8.9
)
Ending balance
$
8.3

 
$
7.9

 
$
8.3

 
$
7.9



Other Liabilities
 
June 30, 2017
 
December 31, 2016
Financing lease obligations
$
6.7

 
$
6.7

Deferred rent
8.9

 
7.3

Other
0.7

 
2.6

Total
$
16.3

 
$
16.6

Short Term Marketable Securities, Available for Sale
Short-Term Marketable Securities, Available-for-Sale
Short-term marketable securities, consisting solely of debt securities, were as follows:
 
June 30, 2017
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Market
Value
U.S. government agencies
$
70.6

 
$

 
$

 
$
70.6

Commercial paper
25.2

 

 

 
25.2

Corporate debt
4.9

 

 

 
4.9

Total
$
100.7

 
$

 
$

 
$
100.7


 
December 31, 2016
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Market
Value
U.S. government agencies
$
22.2

 
$

 
$

 
$
22.2

Corporate debt
3.8

 

 

 
3.8

Commercial paper
3.2

 

 

 
3.2

Total
$
29.2

 
$

 
$

 
$
29.2


As of June 30, 2017, the estimated market value of available-for-sale marketable securities with contractual maturities of up to one year and up to 17 months were $83.5 million and $17.2 million, respectively.
Inventory
Inventory
 
June 30, 2017
 
December 31, 2016
Raw materials
$
16.3

 
$
20.1

Work-in-process
4.1

 
2.3

Finished goods
22.4

 
23.0

Total
$
42.8

 
$
45.4

Accounts Payable and Accrued Liabilities
Accounts Payable and Accrued Liabilities
 
June 30, 2017
 
December 31, 2016
Accounts payable trade
$
16.8

 
$
24.5

Accrued tax, audit, and legal fees
13.6

 
4.5

Clinical trials
0.3

 
1.1

Accrued rebates
13.0

 
8.2

Accrued warranty
8.3

 
9.8

Accrued other
20.2

 
20.0

Total
$
72.2

 
$
68.1

Accrued Warranty
Accrued Warranty
Warranty costs are reflected in the consolidated statements of operations as product cost of sales. A reconciliation of our accrued warranty costs for the three and six months ended June 30, 2017 and 2016 were as follows:
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2017
 
2016
 
2017
 
2016
Beginning balance
$
9.9

 
$
5.7

 
$
9.8

 
$
3.3

Charges to costs and expenses
3.4

 
7.3

 
8.4

 
13.5

Costs incurred
(5.0
)
 
(5.1
)
 
(9.9
)
 
(8.9
)
Ending balance
$
8.3

 
$
7.9

 
$
8.3

 
$
7.9

Other Liabilities
Other Liabilities
 
June 30, 2017
 
December 31, 2016
Financing lease obligations
$
6.7

 
$
6.7

Deferred rent
8.9

 
7.3

Other
0.7

 
2.6

Total
$
16.3

 
$
16.6