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Adjustments in Statement of Cash Flows (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash flows from operating activities    
Net loss $ (26,533) $ (4,519)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization of property and equipment 125 107
Employee and non-employee stock-based compensation 1,393 1,298
Amortization of discounts and premiums on marketable securities (53) (120)
Intangible asset amortization 565 369
Net cash used in operating activities (23,904) (9,125)
Change in Accounting for Amortization of Stock-Based Compensation Cost from Accelerated Attribution Method to Straight-Line Method
   
Cash flows from operating activities    
Net loss   (4,519)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization of property and equipment   107
Employee and non-employee stock-based compensation   1,298
Amortization of discounts and premiums on marketable securities   120
Intangible asset amortization   369
Changes in assets and liabilities, net   (6,500)
Net cash used in operating activities   (9,125)
As Previously Reported | Change in Accounting for Amortization of Stock-Based Compensation Cost from Accelerated Attribution Method to Straight-Line Method
   
Cash flows from operating activities    
Net loss   (4,173)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization of property and equipment   107
Employee and non-employee stock-based compensation   952
Amortization of discounts and premiums on marketable securities   120
Intangible asset amortization   369
Changes in assets and liabilities, net   (6,500)
Net cash used in operating activities   (9,125)
Retrospective Adjustment | Change in Accounting for Amortization of Stock-Based Compensation Cost from Accelerated Attribution Method to Straight-Line Method
   
Cash flows from operating activities    
Net loss   (346)
Adjustments to reconcile net loss to net cash used in operating activities:    
Employee and non-employee stock-based compensation   $ 346