| In millions, except per share items | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 | Mar-31-21 | Dec-31-20 | Sep-30-20 |
| | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| Operating activities | | | | | | | | |
| Net income | 4.0 | 5.2 | 19.7 | 12.4 | 2.9 | -16.4 | -39.4 | -61.2 |
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| Adjustments to reconcile net income to net cash from operating activities: | | | | | | | | |
| Non-cash interest expense | 6.2 | 6.9 | 7.1 | 6.6 | 6.7 | 6.4 | 6.4 | 7.1 |
| Share-based compensation expense | 5.0 | 4.6 | 4.5 | 4.1 | 4.4 | 4.9 | 6.2 | 9.6 |
| Amortization of intangible assets | 1.6 | 1.6 | 1.6 | 1.6 | 1.4 | 1.0 | 0.6 | 0.3 |
| Amortization of right-of-use lease assets | 0.2 | 0.2 | 0.2 | 0.3 | 0.7 | 1.0 | 1.2 | 1.4 |
| Depreciation expense | 0.1 | 0.1 | 0.1 | 0.1 | 0.4 | 1.2 | 2.2 | 3.3 |
| Gain on forgiveness of Paycheck Protection Program loan | | -2.3 | | | | | | |
| Gain on sale of non-controlling equity interest | | -0.7 | | | | | | |
| (Gain) loss on change in fair value of contingent value rights | -0.1 | -0.2 | | | 0.4 | 0.5 | | |
| Loss on foreign currency exchange | 0.4 | | | | | | | |
| Inventory fair value step-up adjustment included in cost of product sales | | | | | | 3.3 | 2.5 | 1.2 |
| Changes in operating assets and liabilities: | | | | | | | | |
| Accounts receivable, net | 2.7 | -1.6 | -2.8 | -4.9 | -5.6 | 0.6 | -1.7 | -1.3 |
| Inventory, net | -2.8 | -1.7 | -1.1 | -0.9 | -0.9 | -2.0 | -1.5 | -1.8 |
| Prepaid expenses and other current assets | 1.3 | 0.6 | -2.4 | -1.0 | -1.2 | -1.5 | 2.3 | 2.8 |
| Accounts payable | -4.0 | -3.6 | -4.1 | -4.9 | -6.3 | -5.4 | -14.2 | -6.8 |
| Accrued expenses and other current liabilities | -5.3 | -6.2 | -4.5 | -5.4 | -6.8 | -7.9 | -11.4 | -5.1 |
| Lease liabilities | -0.2 | -0.2 | -0.2 | -0.3 | -0.9 | -1.5 | -2.1 | -2.6 |
| Net cash provided by operating activities | 13.1 | 13.6 | 28.2 | 17.8 | 7.3 | -8.2 | -37.6 | -47.5 |
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| Investing activities | | | | | | | | |
| Net cash provided by investing activities | 0.3 | | | 0.0 | | | | -31.0 |
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| Financing activities | | | | | | | | |
| Purchases of common stock under stock repurchase plan | -11.4 | -8.6 | -3.4 | | | | | |
| Net proceeds from issuance of common stock under ESPP | 0.5 | 0.5 | 0.4 | 0.4 | 0.4 | 0.4 | 0.5 | 0.6 |
| Net proceeds from issuance of common stock under 2013 Equity Plan | | | | 0.2 | 0.2 | 0.5 | | |
| Net cash (used for) provided by financing activities | -10.9 | -8.0 | -2.8 | 0.6 | 0.5 | 0.8 | 1.1 | 1.2 |
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| Supplemental disclosure of non-cash investing and financing activities | | | | | | | | |
| Forgiveness of Paycheck Protection Program loan | | 2.3 | | | | | | |
| Sale of non-controlling equity interest | | 0.7 | | | | | | |
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| Reconciliation of cash, cash equivalents and restricted cash to the condensed consolidated balance sheets | | | | | | | | |
| Cash and cash equivalents | | | | | | | | |
| Restricted cash | | | | | | | | |