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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Operating Activities:    
Net loss $ (7,572) $ (6,885)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 123 147
Amortization of premium / discount on marketable securities 295 231
Stock-based compensation 1,907 1,329
Change in fair value of contingent consideration liability 50  
Net changes in operating assets and liabilities:    
Interest receivable (45) (68)
Accounts receivable (2,205) 546
Prepaid expenses and other assets (71) 61
Accounts payable and accrued liabilities 1,732 (1,480)
Accrued compensation and employee benefits (1,723) (1,339)
Deferred revenues 18,888 (560)
Net cash provided by / (used in) operating activities 11,379 (8,018)
Investing Activities:    
Purchases of marketable securities (16,773) (16,573)
Maturities of marketable securities 20,786 12,910
Purchases of property and equipment (126) (68)
Net cash provided by / (used in) investing activities 3,887 (3,731)
Financing Activities:    
Proceeds from public offering of common stock, net of issuance costs 93,786  
Proceeds from exercise of stock options 7,585 2,247
Net cash provided by financing activities 101,371 2,247
Net increase / (decrease) in cash and cash equivalents 116,637 (9,502)
Cash and cash equivalents, beginning of period 10,186 21,679
Cash and cash equivalents, end of period $ 126,823 $ 12,177