In millions, except per share items | Dec-31-14 | Dec-31-13 | Dec-31-12 | Nov-01-12 | Dec-31-11 | Dec-31-10 | Dec-31-09 | Dec-31-08 |
| 10-K | 10-K | 10-K | 10-K/A | 10-K | 10-K/A | S-1/A | 10-K/A |
Cash flows from operating activities | | | | | | | | |
Net income | -6.3 | 16.6 | -32.3 | | -29.4 | | | -29.1 |
|
Adjustments to reconcile net income to net cash provided by operating activities | | | | | | | | |
Depreciation and amortization | 0.5 | 0.2 | 0.0 | | | | | |
Amortization of debt discount | 0.6 | 0.6 | 1.4 | | 1.6 | | | |
Stock-based compensation expense | 7.6 | 4.3 | 1.0 | | 0.3 | | | |
Amortization of intangible asset | 4.6 | 3.1 | | | | | | |
Amortization of discount on available-for-sale investments | 0.4 | 0.1 | | | | | | |
Unrealized loss on foreign currency remeasurement adjustments | 0.0 | 0.0 | | | | | | |
Excess tax benefit from stock-based compensation | -0.1 | | | | | | | |
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Changes in assets and liabilities | | | | | | | | |
Accounts receivable | -10.5 | -4.4 | | | | | | |
Inventories | -1.4 | 0.5 | | | | | | |
Prepaid expenses and other assets | -1.7 | -0.8 | -0.2 | | -0.4 | | | |
Accounts payable | -1.9 | 0.1 | 0.3 | | 1.2 | | | |
Deferred revenue | 0.2 | | | | | | | |
Accrued liabilities and other | 6.1 | 9.8 | 1.5 | | 2.6 | | | |
Deferred rent | 0.3 | 0.1 | | | | | | |
Net cash provided by operating activities | 31.0 | -1.2 | -28.5 | | | | | |
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Cash flows from investing activities | | | | | | | | |
Acquisition of property and equipment | -0.7 | -1.1 | 0.0 | | 0.0 | | | |
Purchase of available-for-sale investments | -29.0 | -43.9 | | | | | | |
Maturity of available-for-sale investments | 28.7 | | | | | | | |
Net cash used in investing activities | -15.0 | -34.1 | 0.0 | | | | | |
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Cash flows from financing activities | | | | | | | | |
Proceeds from issuance of common stock from stock option exercises | 2.6 | 0.6 | 0.1 | | | | | |
Income tax benefit on exercise of stock options | 0.1 | | | | | | | |
Principal payments under notes payable | -8.2 | -4.3 | | | | | | |
Net cash provided by (used in) financing activities | 12.5 | 59.6 | 71.4 | | | | | |
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Net increase (decrease) in cash and cash equivalents | 28.6 | 24.4 | 42.8 | | 0.4 | | | |
Cash and cash equivalents, beginning of period | 74.2 | 49.9 | 7.0 | | 6.6 | | | |
Cash and cash equivalents, end of period | 102.8 | 74.2 | 49.9 | | 7.0 | | | |
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Supplemental cash flow information | | | | | | | | |
Cash paid for interest | 1.5 | 1.0 | 0.6 | | | | | |
Cash paid for income tax | 1.1 | | | | | | | |
Stock-based compensation capitalized into inventories | 0.1 | 0.1 | | | | | | |
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Supplemental disclosure of noncash investing and financing activities | | | | | | | | |