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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Cash flows from operating activities    
Net income (loss) used for calculation of basic and diluted EPS $ 8,311 $ (19,295)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation expense 1,671 1,317
Share-based compensation 5,631 2,249
Changes in operating assets and liabilities:    
Accounts receivable 191 (3,311)
Prepaid expenses 2,227 (1,481)
Restricted cash 300 105
Other assets 0 152
Accounts payable 872 1,219
Accrued expenses 1,190 447
Lease exit liability (2,833) (1,067)
Deferred revenue (11,668) 7,266
Deferred rent 4,602 (196)
Net cash provided by (used in) operating activities 10,494 (12,595)
Cash flows from investing activities    
Purchases of property and equipment (6,417) (1,914)
Net cash used in investing activities (6,417) (1,914)
Cash flows from financing activities    
Proceeds from issuance of common stock, net of offering costs 203,467 76,733
Proceeds from stock option exercises 632 486
Net cash provided by financing activities 204,099 77,219
Net change in cash and cash equivalents 208,176 62,710
Cash and cash equivalents at beginning of period 157,591 116,481
Cash and cash equivalents at end of period $ 365,767 $ 179,191