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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Operating Activities:    
Net loss $ (14,553) $ (12,335)
Adjustments to reconcile net loss to net cash provided by / (used in) operating activities:    
Depreciation and amortization 250 305
Amortization of premium / discount on marketable securities 583 456
Stock-based compensation 4,036 2,707
Change in fair value of contingent consideration liability 80  
Net changes in operating assets and liabilities:    
Interest receivable 27 (83)
Accounts receivable (3,814) (789)
Prepaid expenses and other assets (1,076) (753)
Accounts payable and accrued liabilities 1,329 (719)
Accrued compensation and employee benefits (1,221) (1,030)
Deferred revenues 17,164 (1,070)
Net cash provided by / (used in) operating activities 2,805 (13,311)
Investing Activities:    
Purchases of marketable securities (67,003) (27,524)
Maturities of marketable securities 50,604 27,420
Purchases of property and equipment (465) (349)
Net cash used in investing activities (16,864) (453)
Financing Activities:    
Proceeds from public offering of common stock, net of issuance costs 93,796  
Proceeds from issuance of common stock 9,347 4,137
Net cash provided by financing activities 103,143 4,137
Net increase / (decrease) in cash and cash equivalents 89,084 (9,627)
Cash and cash equivalents, beginning of period 10,186 21,679
Cash and cash equivalents, end of period $ 99,270 $ 12,052