| Cash and cash equivalents | |
| Short-term investments available-for-sale | |
| Other current assets | |
| Total current assets | |
| Long-term investments available-for-sale | |
| Property and equipment, net | |
| Total assets | |
| Accounts payable, accrued expenses and other current liabilities | |
| Deferred rent | |
| Leasehold incentive obligation | |
| Deferred revenue | |
| Total current liabilities | |
| Deferred rent | |
| Leasehold incentive obligation | |
| Deferred revenue | |
| Commitments | |
| Preferred stock, $.001 par value; 7,500,000 shares authorized; no shares issued or outstanding at June 30, 2011 (unaudited) and December 31, 2010 | |
| Common stock, $.001 par value; 120,000,000 shares authorized at June 30, 2011 (unaudited) and December 31, 2010; 39,623,092 and 39,091,117 shares issued and outstanding at June 30, 2011 (unaudited) and December 31, 2010, respectively | |
| Additional paid-in capital | |
| Accumulated other comprehensive gain/(loss) | |
| Accumulated deficit | |
| Total stockholders' equity | |
| Total liabilities and stockholders' equity |