| Net loss | -26.31M |
| Loss from disposition of assets | |
| Stock-based compensation | 3.5M |
| Non-employee stock option expense | 64K |
| Depreciation expense | |
| Amortization of investment premiums | 360K |
| Issuance of common stock for services rendered | |
| Accounts receivable | |
| Prepaid expenses and other current assets | -12K |
| Accounts payable, accrued expenses and other liabilities | 121K |
| Deferred revenue | |
| Net cash used in operating activities | |
| Purchases of available-for-sale securities | -2.95M |
| Proceeds from maturity of available-for-sale securities | 21.3M |
| Decrease in restricted cash | |
| Purchases of property and equipment | -267K |
| Net cash provided by (used in) investing activities | |
| Proceeds from exercise of common stock options and employee stock purchases | |
| Payments on capital lease | -5K |
| Net cash provided by financing activities | |
| Net increase (decrease) in cash and cash equivalents | -2.52M |
| Cash and cash equivalents, beginning of period | 26.59M |
| Cash and cash equivalents, end of period | 24.06M |