| Statement of Cash Flows | |
| Cash and cash equivalents at beginning of period | |
| Cash flows from operating activities: | |
| Net loss | |
| Adjustments required to reconcile net loss to net cash used in operating activities: | |
| Depreciation, amortization, and accretion | |
| Stock-based compensation expense | |
| Loss on disposition of property and equipment | |
| Provision for deferred income taxes | |
| Changes in assets and liabilities: | |
| Accounts receivable | |
| Inventories | |
| Prepaid expenses and other assets | |
| Accounts payable | |
| Accrued liabilities | |
| Net cash used in operating activities | |
| Cash flows from investing activities: | |
| Purchase of short-term investments | |
| Proceeds from sales and maturities of short-term investments | |
| Purchases of property and equipment | |
| Net cash provided by investing activities | |
| Cash flows from financing activities: | |
| Issuance of common stock | |
| Repurchase of common stock | |
| Payments under capital lease and note payable obligations | |
| Net cash used in financing activities | |
| Effect of exchange rate changes on cash | |
| Net increase (decrease) in cash and cash equivalents | |
| Cash and cash equivalents at end of period | |
| Other cash flow information: | |
| Cash paid during the period for: Interest | |
| Non-cash investing activities: | |
| Net unrealized gain (loss) on available-for-sale securities |