Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail)

v2.4.0.8
Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Assets  
Total assets $ 54,258
Stock warrants [Member]
 
Liabilities  
Liabilities 3,975
Cash [Member]
 
Assets  
Total assets 17,934
Money market securities [Member]
 
Assets  
Total assets 31,016
Restricted cash [Member]
 
Assets  
Total assets 251
Corporate bonds and commercial paper [Member]
 
Assets  
Total assets 5,057
Level 1 [Member]
 
Assets  
Total assets 49,201
Level 1 [Member] | Cash [Member]
 
Assets  
Total assets 17,934
Level 1 [Member] | Money market securities [Member]
 
Assets  
Total assets 31,016
Level 1 [Member] | Restricted cash [Member]
 
Assets  
Total assets 251
Level 2 [Member]
 
Assets  
Total assets 5,057
Level 2 [Member] | Corporate bonds and commercial paper [Member]
 
Assets  
Total assets 5,057
Level 3 [Member] | Stock warrants [Member]
 
Liabilities  
Liabilities $ 3,975