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Statements of Cash Flows (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net loss | $ (55,283,000) | $ (23,348,000) | $ (11,814,000)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |
(Gain) loss from discontinued operations |  | (1,082,000) | 379,000
Depreciation and amortization | 333,000 | 197,000 | 179,000
Amortization of debt discount | 533,000 | 389,000 | 103,000
Stock-based compensation expense | 10,890,000 | 5,732,000 | 1,890,000
Changes in operating assets and liabilities: |  |  |
Accounts receivable |  |  | 110,000
Prepaid expenses and other current assets | (54,000) | (318,000) | 16,000
Other long-term assets |  |  | (77,000)
Accounts payable | (426,000) | 984,000 | 467,000
Accrued expenses | 3,244,000 | 437,000 | 1,298,000
Deferred revenue |  |  | (272,000)
Net cash used in operating activities | (40,763,000) | (17,009,000) | (7,721,000)
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Purchases of property and equipment | (1,685,000) | (972,000) | (513,000)
Net cash used in investing activities | (1,685,000) | (972,000) | (513,000)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Proceeds from sale of common stock, net of issuance costs | 57,802,000 | 50,491,000 |
Proceeds from sale of units of common stock and warrants, net of issuance costs |  |  | 22,772,000
Proceeds from convertible note financing, net of issuance costs |  | 3,000,000 | 1,312,000
Proceeds from warrant exercises | 600,000 |  |
Proceeds from the exercise of stock options | 2,793,000 | 0 | 0
Proceeds from the issuance of shares under the Employee Stock Purchase Plan | 34,000 | 22,000 | 15,000
Net cash provided by financing activities | 61,229,000 | 53,513,000 | 24,099,000
Net increase in cash and cash equivalents | 18,781,000 | 35,532,000 | 15,865,000
Cash and cash equivalents, beginning of year | 53,506,000 | 17,974,000 | 2,109,000
Cash and cash equivalents, end of year | 72,287,000 | 53,506,000 | 17,974,000
Supplemental Cash Flow Data: |  |  |
Cash paid for interest |  |  | $ 2,000

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