Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Additional Information (Detail)

v2.4.0.8
Fair Value Measurements - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Fair Value Disclosures [Abstract]    
Maximum maturity period of collateralized securities 1 year  
Warrant liability $ 320 $ 214
Maximum maturity period of cash and cash equivalents 90 days  
Maximum maturity period of short-term investments 1 year