Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Details)

v3.3.1.900
Income Taxes - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Contingency [Line Items]      
Increase in equity $ 12,225    
Tax expense (benefit) for change in valuation allowance 1,164 $ 1,223 $ 22,909
Valuation allowance 1,735 2,899  
Unrecognized tax benefits, interest or penalties recognized 0 0  
Unrecognized tax benefits that, if recognized, would affect the effective tax rate 773 $ 577 $ 306
California      
Income Tax Contingency [Line Items]      
Net operating loss carryforwards 29,773    
Research and development credits carryforwards 1,554    
Tax expense (benefit) for change in valuation allowance 1,164    
Valuation allowance 1,735    
Federal      
Income Tax Contingency [Line Items]      
Net operating loss carryforwards $ 58,434    
Net operating loss carryforwards expiration, beginning year 2023    
Research and development credits carryforwards $ 1,537    
Research and development credits carryforwards expiration, beginning year 2022    
State      
Income Tax Contingency [Line Items]      
Net operating loss carryforwards $ 38,991    
Net operating loss carryforwards expiration, beginning year 2016