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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities    
Net income (loss) used for calculation of basic and diluted EPS $ 23,753 $ (15,367)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation expense 1,182 835
Share-based compensation 3,533 1,393
Changes in operating assets and liabilities:    
Accounts receivable (1,399) (641)
Prepaid expenses 1,145 (1,128)
Other assets 0 (229)
Accounts payable 184 808
Accrued expenses 375 (274)
Lease exit liability (2,383) (703)
Deferred revenue (7,812) 17,193
Deferred rent (450) (151)
Net cash provided by operating activities 18,128 1,736
Cash flows from investing activities    
Purchases of property and equipment (3,809) (1,242)
Net cash used in investing activities (3,809) (1,242)
Cash flows from financing activities    
Proceeds from issuance of common stock, net of offering costs 62,692 76,733
Proceeds from stock option exercises 425 306
Net cash provided by financing activities 63,117 77,039
Net change in cash and cash equivalents 77,436 77,533
Cash and cash equivalents at beginning of period 157,591 116,481
Cash and cash equivalents at end of period $ 235,027 $ 194,014