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Commitments and Contingencies - Forgivable Grant (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
job
Dec. 31, 2015
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Feb. 01, 2011
USD ($)
job
Debt Instrument [Line Items]            
Repayment of government grant     $ 0 $ 0 $ 101,000  
Other Commitments [Line Items]            
Recognition of IEDA government grant     0 0 $ 1,638,000  
Forgivable Grant            
Other Commitments [Line Items]            
Recognition of IEDA government grant   $ 2,200,000        
Deferred government grant obligation     $ 0 $ 0    
Forgivable Grant | Operating Expenses            
Other Commitments [Line Items]            
Recognition of IEDA government grant   608,000        
Forgivable Grant | Other Operating Income (Expense)            
Other Commitments [Line Items]            
Recognition of IEDA government grant   $ 1,600,000        
Forgivable Grant | February 2011, 6% IDED Forgivable Grant            
Debt Instrument [Line Items]            
Debt face amount           $ 2,300,000
Number of jobs failed to meet minimum wage requirements | job 10          
Number of jobs required to create and retain for a specific period of time | job           251
Repayment of government grant $ 88,000