| In millions, except per share items | Jun-30-15 | Mar-31-15 | Dec-31-14 | Sep-30-14 | Jun-30-14 | Mar-31-14 | Dec-31-13 | Sep-30-13 |
| | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| Net income | -37.2 | -28.8 | -24.2 | -22.5 | -19.5 | -69.4 | -14.0 | -11.5 |
| Depreciation and amortization [+] | 0.2 | 0.2 | 0.2 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 |
| Depreciation | -0.2 | 0.2 | 0.2 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 |
| Stock-based compensation | 6.7 | 4.4 | 3.3 | 3.2 | 3.0 | 2.9 | 1.7 | 2.1 |
| Change in working capital [+] | 4.2 | 1.8 | 36.7 | 9.3 | 2.4 | 0.2 | 28.6 | 3.4 |
| Restricted cash | | | | 5.1 | 1.2 | 3.9 | 4.6 | 1.5 |
| Inventories | -4.0 | | | | | | | |
| Other current assets | -1.2 | 0.2 | 0.2 | -0.3 | 0.6 | -1.8 | -0.6 | 0.1 |
| Other | 9.4 | 1.6 | 36.5 | 4.6 | 0.6 | -1.9 | 24.5 | 1.8 |
| Other operating activities | 0.8 | 0.5 | -31.8 | -4.4 | -0.4 | 51.3 | -27.0 | -3.7 |
| Cash from operations | -25.3 | -21.9 | -15.8 | -14.3 | -14.4 | -15.0 | -10.7 | -9.7 |
| |
| Capital expenditures | -0.3 | -0.3 | -0.1 | -1.1 | -0.7 | 0.0 | 0.0 | 0.0 |
| Purchases of property and equipment | -0.3 | -0.3 | -0.1 | -1.1 | -0.7 | 0.0 | | |
| Purchases of short-term investments, net | -47.3 | 24.4 | 6.8 | -27.0 | 6.9 | -3.0 | -27.1 | 3.0 |
| Purchases of short-term investments | -71.2 | | -7.6 | -33.2 | -13.1 | -9.6 | -31.4 | |
| Sales of short-term investments | 23.9 | 24.4 | 14.4 | 6.2 | 20.0 | 6.7 | 4.4 | 3.0 |
| Other cash from investing | -0.5 | | | | | | | |
| Cash from investing | -48.1 | 24.2 | 6.7 | -28.2 | 6.2 | -3.0 | -27.1 | 3.0 |
| |
| Issuance of common stock, net | -135.0 | 135.0 | | | | | 125.0 | |
| Option exercises | -0.9 | 0.9 | | 1.3 | -1.1 | 1.1 | | 0.5 |
| Other cash from financing | 134.0 | 0.3 | -1.4 | -0.2 | -2.4 | 0.7 | -0.9 | -0.2 |
| Cash from financing | -0.1 | 134.3 | -1.4 | -1.4 | -1.3 | -0.3 | 124.1 | -0.7 |
| |
| Free cash flow | -25.7 | -22.1 | -16.0 | -15.4 | -15.2 | -15.1 | -10.7 | -9.7 |
| Per share (diluted) | ($0.99) | ($0.95) | ($0.71) | ($0.68) | ($0.67) | ($0.69) | ($0.56) | ($0.52) |
| |
| Cash paid for interest | 1.6 | | 0.1 | 0.6 | 0.4 | | 0.3 | 0.3 |