v2.4.0.6
Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Operating activities    
Net loss $ (25,923) $ (51,502)
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:    
Depreciation and amortization 412 233
Stock based compensation expense 1,518 1,091
Gain on sale of asset, net (5) 0
Impairment loss 0 25,990
Amortization of financing costs 55 0
Changes in operating assets and liabilities:    
Accounts receivable 757 31
Prepaid expenses and other assets (175) (352)
Accounts payable 651 54
Accrued expenses and deferred rent 31 296
Accrued lease expenses (193) 0
Accrued compensation 786 0
Deferred revenue 0 19
Net cash used in operating activities (22,086) (24,140)
Investing activities    
Purchase of fixed assets (122) (555)
Proceeds from sale of asset 5 0
Sales of short-term investments 17,050 26,018
Purchases of short-term investments 0 (1,585)
Net cash provided by investing activities 16,933 23,878
Financing activities    
Payments on capital lease obligations (91) (64)
Proceeds from issuance of debt net of issuance and financing costs 9,726 0
Proceeds from issuance of common stock 25,659 32
Net cash provided by (used in) financing activities 35,294 (32)
Increase in cash and cash equivalents 30,141 (294)
Cash and cash equivalents at beginning of period 14,848 10,743
Cash and cash equivalents at end of period 44,989 10,449
Supplemental disclosures of cash flow information    
Cash paid for interest 164 9
Cash paid for taxes, net 4 2
Supplemental disclosures of non-cash investing and financing activities    
Unrealized gain on investments 385 (122)
Accretion of beneficial conversion charge 0 (9,175)
Fair value of warrants in connection with debt $ 790 $ 0