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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Cash flows from operating activities    
Net income (loss) $ (19,295) $ 2,944
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation expense 1,317 835
Share-based compensation 2,249 394
Fair value adjustment of warrant liabilities   626
Changes in operating assets and liabilities:    
Accounts receivable (3,311) (235)
Prepaid expenses (1,481) (966)
Restricted cash 105  
Other assets 152  
Accounts payable 1,219 (1,941)
Accrued expenses 447 (297)
Lease exit liability (1,067) (466)
Deferred revenue 7,266 (13,969)
Deferred rent (196) 87
Net cash used in operating activities (12,595) (12,988)
Cash flows from investing activities    
Purchases of property and equipment (1,914) (2,037)
Net cash used in investing activities (1,914) (2,037)
Cash flows from financing activities    
Proceeds from issuance of common stock, net of offering costs 76,733  
Proceeds from stock option exercises 486 851
Net cash provided by financing activities 77,219 851
Net change in cash and cash equivalents 62,710 (14,174)
Cash and cash equivalents at beginning of period 116,481 47,743
Cash and cash equivalents at end of period $ 179,191 $ 33,569