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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 194,014 | $ 116,481
Accounts receivable | 2,645 | 2,004
Prepaid expenses | 2,100 | 972
Total current assets | 198,759 | 119,457
Restricted cash | 405 | 405
Property and equipment, net | 5,442 | 5,035
Other assets | 1,114 | 885
Total assets | 205,720 | 125,782
Current liabilities: |  |
Accounts payable | 3,977 | 3,169
Accrued expenses | 3,310 | 3,584
Lease exit liability - current | 1,538 | 1,439
Deferred revenue - current | 20,684 | 20,267
Other liabilities - current | 363 | 363
Total current liabilities | 29,872 | 28,822
Lease exit liability, net of current portion | 7,204 | 8,006
Deferred rent liability | 2,753 | 2,904
Deferred revenue, net of current portion | 23,912 | 7,136
Total liabilities | 63,741 | 46,868
Stockholders' equity: |  |
Common stock, $0.01 par value - 125,000,000 shares authorized, 27,724,454 and 25,177,597 shares outstanding at June 30, 2014 and December 31, 2013, respectively | 277 | 252
Treasury stock, at cost; no shares at June 30, 2014 and 14,381 shares at December 31, 2013 | 0 | (58)
Additional paid-in capital | 332,802 | 254,454
Accumulated deficit | (191,100) | (175,733)
Total stockholders' equity | 141,979 | 78,914
Total liabilities and stockholders' equity | $ 205,720 | $ 125,782

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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- Definition The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 + Details
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