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 | S-1/A |
Assets | | | | | | | | |
Current assets: | | | | | | | | |
Cash and cash equivalents | 40.4 | 29.8 | 34.8 | 29.5 | 29.2 | 84.5 | 18.7 | 18.5 |
Restricted cash | 0.3 | 0.3 | 0.2 | 0.3 | 0.3 | | | |
Short-term investments | 52.8 | 44.1 | 23.0 | | | | | |
Accounts receivable, net | 33.0 | 29.9 | 24.7 | 21.3 | 20.2 | 15.1 | 13.1 | 10.7 |
Inventories | 42.7 | 37.2 | 26.2 | 19.9 | 14.2 | 15.3 | 12.5 | 9.5 |
Prepaid expenses and other current assets | 6.1 | 4.4 | 3.7 | 3.8 | 2.1 | 1.8 | 1.9 | 1.5 |
Total current assets | 175.2 | 145.6 | 112.7 | 112.6 | 119.5 | 116.7 | 46.2 | 40.1 |
Property and equipment, net | 9.7 | 7.3 | 6.5 | 6.6 | 5.1 | 3.9 | 2.7 | 2.1 |
Long-term investments | | 12.0 | 4.0 | 13.7 | 14.5 | | | |
Intangible assets, net | 20.7 | 26.1 | 23.1 | 4.5 | 1.4 | 0.9 | 0.9 | |
Goodwill | 21.5 | 21.9 | 16.8 | 2.8 | 0.2 | | | |
Other assets | 25.5 | 1.6 | 2.0 | 1.7 | 1.3 | 1.1 | 0.9 | 0.1 |
Total assets | 252.5 | 214.5 | 165.1 | 141.9 | 142.0 | 122.7 | 50.6 | 43.5 |
|
Liabilities and stockholders' equity | | | | | | | | |
Current liabilities: | | | | | | | | |
Accounts payable | 26.2 | 25.7 | 17.0 | 17.6 | 15.0 | 13.3 | 14.4 | 9.8 |
Accrued liabilities | 9.1 | 10.8 | 8.9 | 5.9 | 4.8 | 6.8 | 6.6 | 4.5 |
Current portion of deferred revenue | 5.5 | 4.5 | | | | | | |
Total current liabilities | 40.9 | 41.0 | 27.5 | 25.3 | 21.5 | 21.9 | 22.9 | 15.8 |
Other long-term liabilities | 5.3 | 3.9 | 0.7 | 0.9 | 1.3 | 0.5 | 1.6 | 2.2 |
Total liabilities | 46.2 | 45.0 | 28.2 | 26.4 | 23.7 | 24.2 | 26.9 | 19.7 |
|
Commitments and contingencies (Note 14) | | | | | | | | |
Stockholders’ equity: | | | | | | | | |
Common stock | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | | |
Additional paid-in capital | 235.5 | 242.3 | 220.4 | 220.8 | 212.4 | 200.5 | 13.0 | 9.3 |
Accumulated deficit | -28.4 | -72.2 | -82.6 | -95.6 | -93.9 | -102.1 | -105.6 | -101.9 |
Accumulated other comprehensive loss | -0.8 | -0.5 | -0.9 | -0.7 | -0.2 | 0.0 | 0.0 | 0.0 |
Total stockholders' equity | 206.3 | 169.5 | 136.9 | 115.4 | 118.3 | 98.5 | -92.6 | -92.5 |
Total liabilities and stockholders’ equity | 252.5 | 214.5 | 165.1 | 141.9 | 142.0 | 122.7 | 50.6 | |