In millions, except per share items | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 | Dec-31-14 | Dec-31-13 | Dec-31-12 | Dec-31-11 |
| 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
Operating activities | | | | | | | | |
Net (loss) income | 7.6 | -4.0 | -4.1 | -21.6 | -9.4 | -10.6 | -18.9 | -23.5 |
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Adjustments to reconcile net (loss) income to net cash from operating activities: | | | | | | | | |
Depreciation and amortization | 41.8 | 21.7 | 15.9 | 13.6 | 12.5 | 12.6 | 10.8 | 7.9 |
Amortization of deferred costs | 2.2 | | | | | | | |
Gain on disposal of equipment | -0.2 | -0.9 | 0.7 | -0.2 | | 0.1 | 0.0 | |
Stock-based compensation expense | 17.6 | 12.7 | 8.9 | 10.2 | 6.1 | 4.8 | 4.1 | 1.4 |
Benefit for deferred income taxes | -16.6 | -15.4 | 0.0 | 0.0 | | | | |
Non-cash interest expense related to amortization of debt discount | 6.3 | 4.4 | | | | | | |
Other non-cash items, net | -0.1 | -0.5 | 0.1 | -0.1 | 0.5 | | | |
Changes in assets and liabilities: | | | | | | | | |
Accounts receivable | -6.0 | 1.8 | -13.4 | -1.4 | 0.1 | -0.3 | -0.3 | -0.3 |
Prepaid expenses and other current assets | -3.7 | 0.3 | -1.5 | 1.0 | -0.8 | -0.6 | -0.6 | -1.2 |
Other assets | -5.2 | -0.6 | 0.0 | 2.0 | 0.0 | -0.9 | 0.0 | -0.1 |
Accounts payable | -7.4 | 5.0 | -3.3 | 2.9 | 2.0 | -1.4 | -0.6 | 1.9 |
Accrued expenses and other current liabilities | 5.6 | -1.0 | 8.2 | 0.6 | 1.7 | 2.4 | -1.2 | 0.8 |
Other long-term liabilities | -0.2 | 0.1 | -0.6 | -1.3 | 4.5 | -0.1 | 0.0 | 0.2 |
Deferred revenue | 11.3 | 6.2 | 2.4 | 7.5 | 5.6 | 8.8 | 14.4 | 20.4 |
Net cash provided by operating activities | 53.6 | 31.2 | 13.2 | 13.2 | 22.7 | 14.6 | 9.2 | 7.6 |
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Investing activities | | | | | | | | |
Purchases of property and equipment | -13.1 | -17.4 | -6.6 | -9.7 | -14.5 | -9.8 | -13.4 | -13.5 |
Proceeds from sale of property and equipment and businesses | 0.9 | 1.3 | 0.0 | 0.3 | | | | |
Payment for intangibles | -5.8 | -1.3 | | | | | | |
Payment for acquisition, net of cash acquired | -144.6 | -69.8 | -11.6 | -1.3 | -15.8 | | -13.4 | -1.9 |
Net cash used in investing activities | -160.0 | -91.7 | -16.3 | 8.3 | -31.1 | -9.3 | -29.8 | -18.2 |
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Financing activities | | | | | | | | |
Proceeds from exercise of stock options | 3.8 | 6.0 | 3.6 | 2.3 | 4.2 | 4.7 | 1.1 | 1.0 |
Proceeds from issuance of common stock for secondary offering | 199.3 | | | | | | | 55.6 |
Proceeds from issuance of treasury stock under employee stock purchase plan | 3.8 | 6.0 | 3.6 | 2.3 | 4.2 | 4.7 | 1.1 | 1.0 |
Payments of withholding taxes in connection with restricted stock unit vesting | -2.9 | -2.1 | -0.5 | -0.3 | | | | |
Proceeds from long-term borrowings, net of debt issuance costs | 88.1 | 177.8 | | | | | | |
Net cash provided by financing activities | 176.8 | 127.6 | -1.4 | -3.4 | 4.2 | 4.7 | 1.1 | 56.6 |
Effect of currency exchange rate changes on cash | -0.5 | 1.8 | -0.3 | -0.3 | -0.1 | 0.0 | 0.0 | 0.0 |
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Supplemental disclosure of cash flow information | | | | | | | | |
Cash paid for income taxes, net | 0.5 | 0.8 | 1.2 | 1.8 | | | | |
Cash paid for interest | 4.8 | 1.8 | | | | | | |
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Supplemental disclosure of non-cash investing and financing activities: | | | | | | | | |
Capitalization of stock-based compensation | 0.1 | 0.2 | 0.1 | | | | | |
Acquisition of property and equipment included in accounts payable and accrued expenses | -0.1 | -0.6 | 0.9 | -1.8 | 0.9 | 1.8 | 2.1 | 2.7 |