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Cash, Cash Equivalents and Marketable Securities - Cash and Cash Equivalents and Marketable Securities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Investment Holdings [Line Items]        
Cash, cost and estimated fair value $ 9,624 $ 18,985    
Cash equivalents, cost and estimated fair value 200 1,600    
Cash and cash equivalents, cost and estimated fair value 9,870 20,594 $ 38,415 $ 48,955
Cost 112,841 121,188    
Unrealized Gains 0 1    
Unrealized Losses (132) (52)    
Estimated Fair Value 102,839      
Estimated Fair Value 112,709 121,137    
Money market mutual funds [Member]        
Investment Holdings [Line Items]        
Cash equivalents, cost and estimated fair value 246 1,609    
Short-term marketable securities [Member]        
Investment Holdings [Line Items]        
Cost 96,521 93,049    
Unrealized Gains 0 0    
Unrealized Losses (111) (48)    
Estimated Fair Value 96,410 93,001    
Short-term marketable securities [Member] | Commercial paper [Member]        
Investment Holdings [Line Items]        
Cost 7,485 2,499    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Estimated Fair Value 7,485 2,499    
Short-term marketable securities [Member] | Corporate notes and bonds [Member]        
Investment Holdings [Line Items]        
Cost 44,483 53,643    
Unrealized Gains 0 0    
Unrealized Losses (60) (35)    
Estimated Fair Value 44,423 53,608    
Short-term marketable securities [Member] | U.S. agency obligations [Member]        
Investment Holdings [Line Items]        
Cost 32,543 36,907    
Unrealized Gains 0 0    
Unrealized Losses (39) (13)    
Estimated Fair Value 32,504 36,894    
Short-term marketable securities [Member] | Government obligations [Member]        
Investment Holdings [Line Items]        
Cost 12,010      
Unrealized Gains 0      
Unrealized Losses (12)      
Estimated Fair Value 11,998      
Marketable securities, noncurrent [Member]        
Investment Holdings [Line Items]        
Cost 6,450 7,545    
Unrealized Gains 0 1    
Unrealized Losses (21) (4)    
Estimated Fair Value 6,429 7,542    
Marketable securities, noncurrent [Member] | Corporate notes and bonds [Member]        
Investment Holdings [Line Items]        
Cost 4,453 3,501    
Unrealized Gains 0 0    
Unrealized Losses (17) (4)    
Estimated Fair Value 4,436 3,497    
Marketable securities, noncurrent [Member] | U.S. agency obligations [Member]        
Investment Holdings [Line Items]        
Cost   2,049    
Unrealized Gains   0    
Unrealized Losses   0    
Estimated Fair Value   2,049    
Marketable securities, noncurrent [Member] | Government obligations [Member]        
Investment Holdings [Line Items]        
Cost 1,997 1,995    
Unrealized Gains 0 1    
Unrealized Losses (4) 0    
Estimated Fair Value $ 1,993 $ 1,996