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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 179,191 $ 116,481
Accounts receivable 5,315 2,004
Prepaid expenses 2,453 972
Total current assets 186,959 119,457
Restricted cash 300 405
Property and equipment, net 5,633 5,035
Other assets 733 885
Total assets 193,625 125,782
Current liabilities:    
Accounts payable 4,388 3,169
Accrued expenses 4,031 3,584
Lease exit liability 1,589 1,439
Deferred revenue 15,617 20,267
Other liabilities 363 363
Total current liabilities 25,988 28,822
Lease exit liability, net of current portion 6,789 8,006
Deferred rent liability 2,708 2,904
Deferred revenue, net of current portion 19,052 7,136
Total liabilities 54,537 46,868
Stockholders' equity:    
Common stock, $0.01 par value - 125,000,000 shares authorized, 27,772,085 and 25,177,597 shares outstanding at September 30, 2014 and December 31, 2013, respectively 278 252
Treasury stock, at cost; no shares at September 30, 2014 and 14,381 shares at December 31, 2013   (58)
Additional paid-in capital 333,838 254,453
Accumulated deficit (195,028) (175,733)
Total stockholders' equity 139,088 78,914
Total liabilities and stockholders' equity $ 193,625 $ 125,782