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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Unbilled receivables $ 5,200 $ 4,900  
Deferred revenue 16,500   $ 16,100
Deferred revenue recognized 13,600    
Collaborative Arrangement      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Deferred revenue $ 10,400   $ 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)