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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