| Net loss | 301K |
| Depreciation and amortization | |
| Stock-based compensation | 523K |
| (Decrease) increase in allowance for doubtful accounts | -18K |
| (Decrease) increase in inventory obsolescence reserve | |
| Loss on disposal of equipment | 2K |
| Accounts receivable | 950K |
| Inventories | -173K |
| Prepaid expenses and other current assets | 384K |
| Accounts payable | -297K |
| Employee compensation | -317K |
| Deferred income | 966K |
| Warranty reserve | |
| Other current liabilities and accrued expenses | -560K |
| Net cash (used in) provided by operating activities | |
| Sales (purchases) of investments | |
| Purchases of property and equipment and intangible assets | -697K |
| Net cash provided by (used in) investing activities | |
| Proceeds from issuance of common stock under employee stock purchase plan | 97K |
| Proceeds from the exercise of stock options | |
| Repurchase of common stock | |
| Repurchase of common stock upon vesting of restricted stock grants | |
| Net cash used in financing activities | |
| Net increase (decrease) in cash and cash equivalents | -781K |
| Cash and cash equivalents at beginning of period | |
| Cash and cash equivalents at end of period | |