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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Operating activities    
Net loss $ (39.4) $ (16.6)
Adjustments to reconcile net loss to cash used in operating activities:    
Depreciation and amortization 7.3 5.0
Share-based compensation 52.7 36.6
Accretion and amortization related to marketable securities, net 0.1 0.2
Amortization of debt issuance costs 0.0 0.1
Loss on disposal of equipment 0.0 (0.2)
Changes in operating assets and liabilities:    
Accounts receivable, net 0.8 (3.1)
Inventory (7.2) (6.4)
Prepaid and other assets (2.7) (1.0)
Increase (Decrease) in Restricted Cash 0.0 (0.3)
Accounts payable and accrued liabilities 9.3 3.7
Accrued payroll and related expenses (1.7) (0.2)
Deferred revenue (0.2) 0.1
Deferred rent and other liabilities 0.9 0.9
Net cash provided by operating activities 19.9 19.8
Investing activities    
Purchase of available-for-sale marketable securities (20.9) (27.5)
Proceeds from the maturity of available-for-sale marketable securities 21.7 9.2
Purchase of property and equipment (22.0) (14.3)
Cash Acquired from Acquisition 0.4 (0.5)
Net cash used in investing activities (20.8) (33.1)
Financing activities    
Net proceeds from issuance of common stock 4.8 10.4
Repayment of long-term debt (2.3) (1.2)
Net cash provided by financing activities 2.5 9.2
Effect of Exchange Rate on Cash and Cash Equivalents (0.2) 0.0
Increase (decrease) in cash and cash equivalents 1.4 (4.1)
Cash and cash equivalents, beginning of period 86.1 71.8
Cash and cash equivalents, end of period 87.5 67.7
Supplemental disclosure of non-cash investing and financing transactions:    
Issuance of common stock in connection with acquisition 7.2 0.0
Acquisition-related holdback liability 1.8 0.0
Assets acquired and financing obligation under build-to-suit leasing arrangement $ 6.0 $ 0.0