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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Unbilled receivables $ 5,700 $ 4,900  
Deferred revenue 13,100   $ 16,100
Deferred revenue recognized 14,800    
Collaborative Arrangement      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Deferred revenue $ 5,200   $ 10,500
ASU 2018-07 adoption | Accumulated Deficit      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Cumulative effect adjustment for new ASU's   $ (1,266)