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STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified | 6 Months Ended
--- | ---
Jun. 30, 2013 | Jun. 30, 2012
Operating Activities: |  |
Net loss | $ (22,630) | $ (13,256)
Reconciliation of net loss to net cash used in operating activities: |  |
Change in fair value of warrant liability | (267) |
Depreciation and amortization | 961 | 810
Amortization of net premiums on investments | 232 |
Gain on disposal of property and equipment | (43) | (19)
Deferred rent | 458 | 251
Non-cash stock-based compensation | 1,121 | 1,176
Changes in operating assets and liabilities: |  |
Restricted cash | 986 |
Accounts receivables | 104 | 467
Unbilled receivables | (245) | (2,395)
Prepaid expenses and other assets | 702 | 58
Accounts payable and accrued expenses | (40) | 461
Deferred revenue | (258) |
Lease incentives received | 703 | 2,101
Net cash used in operating activities | (18,216) | (10,346)
Investing Activities: |  |
Capital expenditures | (3,157) | (1,076)
Proceeds from disposal of property and equipment | 81 | 167
Proceeds from maturities of investments | 9,649 | 2,500
Purchases of investments | (14,754) | (9,389)
Net cash used in investing activities | (8,181) | (7,798)
Financing Activities: |  |
Principal payments of capital lease | (29) |
Principal payments of notes payable | (136) | (20)
Proceeds from notes payable | 1,450 | 100
Restricted cash | (1) | (755)
Net proceeds from sales of common stock, net of offering costs of $0.3 million and $0.3 million, respectively | 10,018 | 20,023
Proceeds from the exercise of stock options | 270 | 26
Net cash provided by financing activities | 11,572 | 19,374
Net (decrease) increase in cash and cash equivalents | (14,825) | 1,230
Cash and cash equivalents at beginning of period | 17,399 | 14,104
Cash and cash equivalents at end of period | 2,574 | 15,334
Supplemental disclosure of non-cash activities: |  |
Property and equipment purchases included in accounts payable and accrued expenses | 1,026 | 278
Deposit applied towards the purchase of laboratory equipment |  | 500
Supplemental disclosure of cash flow information: |  |
Cash payments of interest | $ 61 |

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- Definition The net cash inflow or outflow from cash and cash items that are not available for withdrawal or usage. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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