Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Impact of Accounting Pronouncements Adoption on Balance Sheet (Details)

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Summary of Significant Accounting Policies - Impact of Accounting Pronouncements Adoption on Balance Sheet (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Accounting Policies [Abstract]      
Operating lease ROU asset $ 4,139 $ 4,236  
Operating lease liabilities, current 804 774  
Operating lease liabilities, noncurrent $ 6,153 $ 6,364  
Deferred rent, current     $ 354
Deferred rent, noncurrent     $ 2,548